7 files changed, 1862 insertions, 0 deletions

diff --git a/libparc/parc/statistics/parc_BasicStats.c b/libparc/parc/statistics/parc_BasicStats.c
new file mode 100644
index 00000000..b66bbd7a
--- /dev/null
+++ b/libparc/parc/statistics/parc_BasicStats.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ */
+#include <config.h>
+
+#include <math.h>
+
+#include <parc/algol/parc_Object.h>
+#include <parc/algol/parc_DisplayIndented.h>
+#include <parc/algol/parc_Memory.h>
+
+#include <parc/statistics/parc_BasicStats.h>
+
+struct PARCBasicStats {
+    int64_t count;
+    double maximum;
+    double minimum;
+    double mean;
+    double variance;
+};
+
+static inline bool
+_parcBasicStats_FloatEquals(double x, double y, double e)
+{
+    return fabs(x - y) < e;
+}
+
+static bool
+_parcBasicStats_Destructor(PARCBasicStats **instancePtr)
+{
+    assertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCBasicStats pointer.");
+
+    return true;
+}
+
+parcObject_ImplementAcquire(parcBasicStats, PARCBasicStats);
+
+parcObject_ImplementRelease(parcBasicStats, PARCBasicStats);
+
+parcObject_Override(
+    PARCBasicStats, PARCObject,
+    .destructor = (PARCObjectDestructor *) _parcBasicStats_Destructor,
+    .copy = (PARCObjectCopy *) parcBasicStats_Copy,
+    .toString = (PARCObjectToString *)  parcBasicStats_ToString,
+    .equals = (PARCObjectEquals *)  parcBasicStats_Equals,
+    .compare = (PARCObjectCompare *)  parcBasicStats_Compare,
+    .hashCode = (PARCObjectHashCode *)  parcBasicStats_HashCode,
+    .toJSON = (PARCObjectToJSON *)  parcBasicStats_ToJSON);
+
+
+void
+parcBasicStats_AssertValid(const PARCBasicStats *instance)
+{
+    assertTrue(parcBasicStats_IsValid(instance),
+               "PARCBasicStats is not valid.");
+}
+
+
+PARCBasicStats *
+parcBasicStats_Create(void)
+{
+    PARCBasicStats *result = parcObject_CreateInstance(PARCBasicStats);
+
+    if (result != NULL) {
+        result->count = 0;
+        result->mean = 0;
+        result->variance = 0;
+        result->maximum = 0;
+        result->minimum = 0;
+    }
+
+    return result;
+}
+
+int
+parcBasicStats_Compare(const PARCBasicStats *instance, const PARCBasicStats *other)
+{
+    int result = 0;
+
+    return result;
+}
+
+PARCBasicStats *
+parcBasicStats_Copy(const PARCBasicStats *original)
+{
+    PARCBasicStats *result = parcBasicStats_Create();
+    result->count = original->count;
+    result->mean = original->mean;
+    result->variance = original->variance;
+    result->maximum = original->maximum;
+    result->minimum = original->minimum;
+
+    return result;
+}
+
+void
+parcBasicStats_Display(const PARCBasicStats *stats, int indentation)
+{
+    parcDisplayIndented_PrintLine(indentation,
+                                  "PARCBasicStats@%p { .count=%" PRId64 " .minimum=%llf .maximum=%llf .mean=%llf }",
+                                  stats, stats->count, stats->minimum, stats->maximum, stats->mean);
+}
+
+bool
+parcBasicStats_Equals(const PARCBasicStats *x, const PARCBasicStats *y)
+{
+    bool result = false;
+
+    if (x == y) {
+        result = true;
+    } else if (x == NULL || y == NULL) {
+        result = false;
+    } else {
+        if (x->count == y->count) {
+            if (_parcBasicStats_FloatEquals(x->maximum, y->maximum, 0.00001)) {
+                if (_parcBasicStats_FloatEquals(x->minimum, y->minimum, 0.00001)) {
+                    if (_parcBasicStats_FloatEquals(x->mean, y->mean, 0.00001)) {
+                        result = true;
+                    }
+                }
+            }
+        }
+    }
+
+    return result;
+}
+
+PARCHashCode
+parcBasicStats_HashCode(const PARCBasicStats *instance)
+{
+    PARCHashCode result = 0;
+
+    return result;
+}
+
+bool
+parcBasicStats_IsValid(const PARCBasicStats *stats)
+{
+    bool result = false;
+
+    if (stats != NULL) {
+        result = true;
+    }
+
+    return result;
+}
+
+PARCJSON *
+parcBasicStats_ToJSON(const PARCBasicStats *stats)
+{
+    PARCJSON *result = parcJSON_Create();
+
+    if (result != NULL) {
+        PARCJSONPair *pair = parcJSONPair_CreateFromDouble("maximum", stats->maximum);
+        parcJSON_AddPair(result, pair);
+        parcJSONPair_Release(&pair);
+
+        pair = parcJSONPair_CreateFromDouble("minimum", stats->minimum);
+        parcJSON_AddPair(result, pair);
+        parcJSONPair_Release(&pair);
+
+        pair = parcJSONPair_CreateFromDouble("mean", stats->mean);
+        parcJSON_AddPair(result, pair);
+        parcJSONPair_Release(&pair);
+
+        pair = parcJSONPair_CreateFromDouble("variance", stats->variance);
+        parcJSON_AddPair(result, pair);
+        parcJSONPair_Release(&pair);
+
+        pair = parcJSONPair_CreateFromInteger("count", stats->count);
+        parcJSON_AddPair(result, pair);
+        parcJSONPair_Release(&pair);
+    }
+
+    return result;
+}
+
+char *
+parcBasicStats_ToString(const PARCBasicStats *stats)
+{
+    char *result = parcMemory_Format("PARCBasicStats@%p { .count=%" PRId64 " .minimum=%llf .maximum=%llf .mean=%llf }",
+                                     stats, stats->count, stats->minimum, stats->maximum, stats->mean);
+
+    return result;
+}
+
+void
+parcBasicStats_Update(PARCBasicStats *stats, double value)
+{
+    stats->count++;
+
+    if (value > stats->maximum) {
+        stats->maximum = value;
+    }
+
+    if (value < stats->minimum) {
+        stats->minimum = value;
+    }
+
+    double mean_ = stats->mean;
+
+    double xMinusOldMean = value - mean_;
+
+    stats->mean = mean_ + xMinusOldMean / stats->count;
+
+    double xMinusCurrentMean = value - stats->mean;
+
+    stats->variance = ((stats->variance * (stats->count - 1)) + xMinusOldMean * xMinusCurrentMean) / stats->count;
+}
+
+double
+parcBasicStats_Mean(const PARCBasicStats *stats)
+{
+    return stats->mean;
+}
+
+double
+parcBasicStats_Variance(const PARCBasicStats *stats)
+{
+    return stats->variance;
+}
+
+double
+parcBasicStats_StandardDeviation(const PARCBasicStats *stats)
+{
+    return sqrt(stats->variance);
+}
+
+double
+parcBasicStats_Maximum(const PARCBasicStats *stats)
+{
+    return stats->maximum;
+}
+
+double
+parcBasicStats_Minimum(const PARCBasicStats *stats)
+{
+    return stats->minimum;
+}
+
+double
+parcBasicStats_Range(const PARCBasicStats *stats)
+{
+    return stats->maximum - stats->minimum;
+}
diff --git a/libparc/parc/statistics/parc_BasicStats.h b/libparc/parc/statistics/parc_BasicStats.h
new file mode 100755
index 00000000..5f82e582
--- /dev/null
+++ b/libparc/parc/statistics/parc_BasicStats.h
@@ -0,0 +1,466 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file parc_BasicStats.h
+ * @ingroup statistics
+ * @brief A basic descriptive statistics implementation for time-series data.
+ *
+ */
+#ifndef PARCLIbrary_parc_IntegerStats
+#define PARCLIbrary_parc_IntegerStats
+#include <stdbool.h>
+
+#include <parc/algol/parc_JSON.h>
+#include <parc/algol/parc_HashCode.h>
+
+struct PARCBasicStats;
+typedef struct PARCBasicStats PARCBasicStats;
+
+/**
+ * Increase the number of references to a `PARCBasicStats` instance.
+ *
+ * Note that new `PARCBasicStats` is not created,
+ * only that the given `PARCBasicStats` reference count is incremented.
+ * Discard the reference by invoking `parcBasicStats_Release`.
+ *
+ * @param [in] instance A pointer to a valid PARCBasicStats instance.
+ *
+ * @return The same value as @p instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     PARCBasicStats *b = parcBasicStats_Acquire();
+ *
+ *     parcBasicStats_Release(&a);
+ *     parcBasicStats_Release(&b);
+ * }
+ * @endcode
+ */
+PARCBasicStats *parcBasicStats_Acquire(const PARCBasicStats *instance);
+
+#ifdef PARCLIbrary_DISABLE_VALIDATION
+#  define parcBasicStats_OptionalAssertValid(_instance_)
+#else
+#  define parcBasicStats_OptionalAssertValid(_instance_) parcBasicStats_AssertValid(_instance_)
+#endif
+
+/**
+ * Assert that the given `PARCBasicStats` instance is valid.
+ *
+ * @param [in] instance A pointer to a valid PARCBasicStats instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     parcBasicStats_AssertValid(a);
+ *
+ *     printf("Instance is valid.\n");
+ *
+ *     parcBasicStats_Release(&b);
+ * }
+ * @endcode
+ */
+void parcBasicStats_AssertValid(const PARCBasicStats *instance);
+
+/**
+ * Create an instance of PARCBasicStats
+ *
+ * <#Paragraphs Of Explanation#>
+ *
+ * @return non-NULL A pointer to a valid PARCBasicStats instance.
+ * @return NULL An error occurred.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     parcBasicStats_Release(&a);
+ * }
+ * @endcode
+ */
+PARCBasicStats *parcBasicStats_Create(void);
+
+/**
+ * Compares @p instance with @p other for order.
+ *
+ * Returns a negative integer, zero, or a positive integer as @p instance
+ * is less than, equal to, or greater than @p other.
+ *
+ * @param [in] instance A pointer to a valid PARCBasicStats instance.
+ * @param [in] other A pointer to a valid PARCBasicStats instance.
+ *
+ * @return <0 Instance is less than @p other.
+ * @return 0 Instance a and instance b compare the same.
+ * @return >0 Instance a is greater than instance b.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *     PARCBasicStats *b = parcBasicStats_Create();
+ *
+ *     if (parcBasicStats_Compare(a, b) == 0) {
+ *         printf("Instances are equal.\n");
+ *     }
+ *
+ *     parcBasicStats_Release(&a);
+ *     parcBasicStats_Release(&b);
+ * }
+ * @endcode
+ *
+ * @see parcBasicStats_Equals
+ */
+int parcBasicStats_Compare(const PARCBasicStats *instance, const PARCBasicStats *other);
+
+/**
+ * Create an independent copy the given `PARCBuffer`
+ *
+ * A new buffer is created as a complete copy of the original.
+ *
+ * @param [in] original A pointer to a valid PARCBasicStats instance.
+ *
+ * @return NULL Memory could not be allocated.
+ * @return non-NULL A pointer to a new `PARCBasicStats` instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     PARCBasicStats *copy = parcBasicStats_Copy(&b);
+ *
+ *     parcBasicStats_Release(&b);
+ *     parcBasicStats_Release(&copy);
+ * }
+ * @endcode
+ */
+PARCBasicStats *parcBasicStats_Copy(const PARCBasicStats *original);
+
+/**
+ * Print a human readable representation of the given `PARCBasicStats`.
+ *
+ * @param [in] instance A pointer to a valid PARCBasicStats instance.
+ * @param [in] indentation The indentation level to use for printing.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     parcBasicStats_Display(a, 0);
+ *
+ *     parcBasicStats_Release(&a);
+ * }
+ * @endcode
+ */
+void parcBasicStats_Display(const PARCBasicStats *instance, int indentation);
+
+/**
+ * Determine if two `PARCBasicStats` instances are equal.
+ *
+ * The following equivalence relations on non-null `PARCBasicStats` instances are maintained: *
+ *   * It is reflexive: for any non-null reference value x, `parcBasicStats_Equals(x, x)` must return true.
+ *
+ *   * It is symmetric: for any non-null reference values x and y, `parcBasicStats_Equals(x, y)` must return true if and only if
+ *        `parcBasicStats_Equals(y x)` returns true.
+ *
+ *   * It is transitive: for any non-null reference values x, y, and z, if
+ *        `parcBasicStats_Equals(x, y)` returns true and
+ *        `parcBasicStats_Equals(y, z)` returns true,
+ *        then `parcBasicStats_Equals(x, z)` must return true.
+ *
+ *   * It is consistent: for any non-null reference values x and y, multiple invocations of `parcBasicStats_Equals(x, y)`
+ *         consistently return true or consistently return false.
+ *
+ *   * For any non-null reference value x, `parcBasicStats_Equals(x, NULL)` must return false.
+ *
+ * @param [in] x A pointer to a valid PARCBasicStats instance.
+ * @param [in] y A pointer to a valid PARCBasicStats instance.
+ *
+ * @return true The instances x and y are equal.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *     PARCBasicStats *b = parcBasicStats_Create();
+ *
+ *     if (parcBasicStats_Equals(a, b)) {
+ *         printf("Instances are equal.\n");
+ *     }
+ *
+ *     parcBasicStats_Release(&a);
+ *     parcBasicStats_Release(&b);
+ * }
+ * @endcode
+ * @see parcBasicStats_HashCode
+ */
+bool parcBasicStats_Equals(const PARCBasicStats *x, const PARCBasicStats *y);
+
+/**
+ * Returns a hash code value for the given instance.
+ *
+ * The general contract of `HashCode` is:
+ *
+ * Whenever it is invoked on the same instance more than once during an execution of an application,
+ * the `HashCode` function must consistently return the same value,
+ * provided no information used in a corresponding comparisons on the instance is modified.
+ *
+ * This value need not remain consistent from one execution of an application to another execution of the same application.
+ * If two instances are equal according to the {@link parcBasicStats_Equals} method,
+ * then calling the {@link parcBasicStats_HashCode} method on each of the two instances must produce the same integer result.
+ *
+ * It is not required that if two instances are unequal according to the
+ * {@link parcBasicStats_Equals} function,
+ * then calling the `parcBasicStats_HashCode`
+ * method on each of the two objects must produce distinct integer results.
+ *
+ * @param [in] instance A pointer to a valid PARCBasicStats instance.
+ *
+ * @return The hashcode for the given instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     PARCHashCode hashValue = parcBasicStats_HashCode(buffer);
+ *     parcBasicStats_Release(&a);
+ * }
+ * @endcode
+ */
+PARCHashCode parcBasicStats_HashCode(const PARCBasicStats *instance);
+
+/**
+ * Determine if an instance of `PARCBasicStats` is valid.
+ *
+ * Valid means the internal state of the type is consistent with its required current or future behaviour.
+ * This may include the validation of internal instances of types.
+ *
+ * @param [in] instance A pointer to a valid PARCBasicStats instance.
+ *
+ * @return true The instance is valid.
+ * @return false The instance is not valid.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     if (parcBasicStats_IsValid(a)) {
+ *         printf("Instance is valid.\n");
+ *     }
+ *
+ *     parcBasicStats_Release(&a);
+ * }
+ * @endcode
+ *
+ */
+bool parcBasicStats_IsValid(const PARCBasicStats *instance);
+
+/**
+ * Release a previously acquired reference to the given `PARCBasicStats` instance,
+ * decrementing the reference count for the instance.
+ *
+ * The pointer to the instance is set to NULL as a side-effect of this function.
+ *
+ * If the invocation causes the last reference to the instance to be released,
+ * the instance is deallocated and the instance's implementation will perform
+ * additional cleanup and release other privately held references.
+ *
+ * @param [in,out] instancePtr A pointer to a pointer to the instance to release.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     parcBasicStats_Release(&a);
+ * }
+ * @endcode
+ */
+void parcBasicStats_Release(PARCBasicStats **instancePtr);
+
+/**
+ * Create a `PARCJSON` instance (representation) of the given object.
+ *
+ * @param [in] instance A pointer to a valid PARCBasicStats instance.
+ *
+ * @return NULL Memory could not be allocated to contain the `PARCJSON` instance.
+ * @return non-NULL An allocated C string that must be deallocated via parcMemory_Deallocate().
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     PARCJSON *json = parcBasicStats_ToJSON(a);
+ *
+ *     char *cString = parcJSON_ToString(json);
+ *     printf("JSON representation: %s\n", cString);
+ *
+ *     parcMemory_Deallocate(&cString);
+ *     parcJSON_Release(&json);
+ *
+ *     parcBasicStats_Release(&a);
+ * }
+ * @endcode
+ */
+PARCJSON *parcBasicStats_ToJSON(const PARCBasicStats *instance);
+
+/**
+ * Produce a null-terminated string representation of the specified `PARCBasicStats`.
+ *
+ * The result must be freed by the caller via {@link parcMemory_Deallocate}.
+ *
+ * @param [in] instance A pointer to a valid PARCBasicStats instance.
+ *
+ * @return NULL Cannot allocate memory.
+ * @return non-NULL A pointer to an allocated, null-terminated C string that must be deallocated via {@link parcMemory_Deallocate}.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBasicStats *a = parcBasicStats_Create();
+ *
+ *     char *string = parcBasicStats_ToString(a);
+ *
+ *     parcBasicStats_Release(&a);
+ *
+ *     parcMemory_Deallocate(&string);
+ * }
+ * @endcode
+ *
+ * @see parcBasicStats_Display
+ */
+char *parcBasicStats_ToString(const PARCBasicStats *instance);
+
+/**
+ * Add a value to the observed set of values.
+ *
+ * @param [in] stats A pointer to a valid `PARCBasicStats` instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     <#example#>
+ * }
+ * @endcode
+ */
+void parcBasicStats_Update(PARCBasicStats *stats, double value);
+
+/**
+ * The arithmetic mean of the set of observed values.
+ *
+ * @param [in] stats A pointer to a valid `PARCBasicStats` instance.
+ *
+ * @return The arithmetic mean of the set of observed values.
+ *
+ * Example:
+ * @code
+ * {
+ *     <#example#>
+ * }
+ * @endcode
+ */
+double parcBasicStats_Mean(const PARCBasicStats *stats);
+
+/**
+ * The variance of the set of observed values.
+ *
+ * @param [in] stats A pointer to a valid `PARCBasicStats` instance.
+ *
+ * @return  The variance of the set of observed values.
+ *
+ * Example:
+ * @code
+ * {
+ *     <#example#>
+ * }
+ * @endcode
+ */
+double parcBasicStats_Variance(const PARCBasicStats *stats);
+
+/**
+ * The standard deviation of the set of observed values.
+ *
+ * @param [in] stats A pointer to a valid `PARCBasicStats` instance.
+ *
+ * @return  The standard deviation of the set of observed values.
+ *
+ * Example:
+ * @code
+ * {
+ *     <#example#>
+ * }
+ * @endcode
+ */
+double parcBasicStats_StandardDeviation(const PARCBasicStats *stats);
+
+/**
+ * The maximum value of the set of observed values.
+ *
+ * @param [in] stats A pointer to a valid `PARCBasicStats` instance.
+ *
+ * @return The maximum value of the set of observed values.
+ *
+ * Example:
+ * @code
+ * {
+ *     <#example#>
+ * }
+ * @endcode
+ */
+double parcBasicStats_Maximum(const PARCBasicStats *stats);
+
+/**
+ * The minimum value of the set of observed values.
+ *
+ * @param [in] stats A pointer to a valid `PARCBasicStats` instance.
+ *
+ * @return The minimum value of the set of observed values.
+ *
+ * Example:
+ * @code
+ * {
+ *     <#example#>
+ * }
+ * @endcode
+ */
+double parcBasicStats_Minimum(const PARCBasicStats *stats);
+
+/**
+ * The arithmetic range of the observed set of values.
+ *
+ * @param [in] stats A pointer to a valid `PARCBasicStats` instance.
+ *
+ * @return The arithmetic range of the observed set of values.
+ *
+ * Example:
+ * @code
+ * {
+ *     <#example#>
+ * }
+ * @endcode
+ */
+double parcBasicStats_Range(const PARCBasicStats *stats);
+#endif
diff --git a/libparc/parc/statistics/parc_EWMA.c b/libparc/parc/statistics/parc_EWMA.c
new file mode 100644
index 00000000..20f85d4a
--- /dev/null
+++ b/libparc/parc/statistics/parc_EWMA.c
@@ -0,0 +1,207 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ */
+#include <config.h>
+
+#include <math.h>
+
+#include <parc/algol/parc_Object.h>
+#include <parc/algol/parc_DisplayIndented.h>
+#include <parc/algol/parc_Memory.h>
+
+#include <parc/statistics/parc_EWMA.h>
+
+struct PARCEWMA {
+    bool initialized;
+    int64_t value;
+    double coefficient;
+    double coefficient_r;
+};
+
+static inline bool
+_parcEWMA_FloatEquals(double x, double y, double e)
+{
+    return fabs(x - y) < e;
+}
+
+static bool
+_parcEWMA_Destructor(PARCEWMA **instancePtr)
+{
+    assertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCEWMA pointer.");
+
+    return true;
+}
+
+parcObject_ImplementAcquire(parcEWMA, PARCEWMA);
+
+parcObject_ImplementRelease(parcEWMA, PARCEWMA);
+
+parcObject_Override(
+    PARCEWMA, PARCObject,
+    .destructor = (PARCObjectDestructor *) _parcEWMA_Destructor,
+    .copy = (PARCObjectCopy *) parcEWMA_Copy,
+    .toString = (PARCObjectToString *)  parcEWMA_ToString,
+    .equals = (PARCObjectEquals *)  parcEWMA_Equals,
+    .compare = (PARCObjectCompare *)  parcEWMA_Compare,
+    .hashCode = (PARCObjectHashCode *)  parcEWMA_HashCode,
+    .toJSON = (PARCObjectToJSON *)  parcEWMA_ToJSON);
+
+void
+parcEWMA_AssertValid(const PARCEWMA *instance)
+{
+    assertTrue(parcEWMA_IsValid(instance),
+               "PARCEWMA is not valid.");
+}
+
+PARCEWMA *
+parcEWMA_Create(double coefficient)
+{
+    PARCEWMA *result = parcObject_CreateInstance(PARCEWMA);
+    if (result != NULL) {
+        result->initialized = false;
+        result->value = 0;
+        result->coefficient = coefficient;
+        result->coefficient_r = 1.0 - coefficient;
+    }
+
+    return result;
+}
+
+int
+parcEWMA_Compare(const PARCEWMA *instance, const PARCEWMA *other)
+{
+    int result = 0;
+
+    if (instance == other) {
+        result = 0;
+    } else if (instance == NULL) {
+        result = -1;
+    } else if (other == NULL) {
+        result = 1;
+    } else {
+        result = instance->value - other->value;
+    }
+
+    return result;
+}
+
+PARCEWMA *
+parcEWMA_Copy(const PARCEWMA *original)
+{
+    PARCEWMA *result = parcEWMA_Create(original->coefficient);
+    result->initialized = original->initialized;
+    result->value = original->value;
+
+    return result;
+}
+
+void
+parcEWMA_Display(const PARCEWMA *ewma, int indentation)
+{
+    parcDisplayIndented_PrintLine(indentation,
+                                  "PARCEWMA@%p { .initialized=%s .coefficient=%lf, .value=%" PRId64 " }",
+                                  ewma,
+                                  ewma->initialized ? "true" : "false",
+                                  ewma->coefficient,
+                                  ewma->value);
+}
+
+bool
+parcEWMA_Equals(const PARCEWMA *x, const PARCEWMA *y)
+{
+    bool result = false;
+
+    if (x == y) {
+        result = true;
+    } else if (x == NULL || y == NULL) {
+        result = false;
+    } else {
+        if (x->initialized == y->initialized) {
+            if (_parcEWMA_FloatEquals(x->coefficient, y->coefficient, 0.00001)) {
+                if (_parcEWMA_FloatEquals(x->value, y->value, 0.00001)) {
+                    result = true;
+                }
+            }
+        }
+    }
+
+    return result;
+}
+
+PARCHashCode
+parcEWMA_HashCode(const PARCEWMA *instance)
+{
+    PARCHashCode result = 0;
+
+    return result;
+}
+
+bool
+parcEWMA_IsValid(const PARCEWMA *instance)
+{
+    bool result = false;
+
+    if (instance != NULL) {
+        result = true;
+    }
+
+    return result;
+}
+
+PARCJSON *
+parcEWMA_ToJSON(const PARCEWMA *instance)
+{
+    PARCJSON *result = parcJSON_Create();
+
+    if (result != NULL) {
+    }
+
+    return result;
+}
+
+char *
+parcEWMA_ToString(const PARCEWMA *ewma)
+{
+    char *result = parcMemory_Format("PARCEWMA@%p { .initialized=%s .coefficient=%lf, .value=%" PRId64 " }",
+                                     ewma,
+                                     ewma->initialized ? "true" : "false",
+                                     ewma->coefficient,
+                                     ewma->value);
+    return result;
+}
+
+int64_t
+parcEWMA_Update(PARCEWMA *ewma, const int64_t value)
+{
+    if (ewma->initialized) {
+        // E_t = a * V + (1 - a) * E_(t-1)
+        double x = (ewma->coefficient * value);
+        double y = (ewma->coefficient_r * ewma->value);
+
+        ewma->value = x + y;
+    } else {
+        ewma->value = value;
+        ewma->initialized = true;
+    }
+    return ewma->value;
+}
+
+int64_t
+parcEWMA_GetValue(const PARCEWMA *ewma)
+{
+    return ewma->value;
+}
diff --git a/libparc/parc/statistics/parc_EWMA.h b/libparc/parc/statistics/parc_EWMA.h
new file mode 100755
index 00000000..bbcb53df
--- /dev/null
+++ b/libparc/parc/statistics/parc_EWMA.h
@@ -0,0 +1,413 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file parc_EWMA.h
+ * @ingroup statistics
+ * @brief A simple exponential moving average smoothing filter for integers.
+ *
+ * An exponentially weighted moving average (EWMA) is a type of infinite impulse response filter that
+ * applies weighting factors which decrease exponentially. The weighting for each older datum decreases
+ * exponentially, never reaching zero.
+ *
+ */
+#ifndef PARCLibrary_parc_EWMA
+#define PARCLibrary_parc_EWMA
+#include <stdbool.h>
+
+#include <parc/algol/parc_JSON.h>
+#include <parc/algol/parc_HashCode.h>
+
+struct PARCEWMA;
+typedef struct PARCEWMA PARCEWMA;
+
+/**
+ * Increase the number of references to a `PARCEWMA` instance.
+ *
+ * Note that new `PARCEWMA` is not created,
+ * only that the given `PARCEWMA` reference count is incremented.
+ * Discard the reference by invoking `parcEWMA_Release`.
+ *
+ * @param [in] instance A pointer to a valid PARCEWMA instance.
+ *
+ * @return The same value as @p instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     PARCEWMA *b = parcEWMA_Acquire();
+ *
+ *     parcEWMA_Release(&a);
+ *     parcEWMA_Release(&b);
+ * }
+ * @endcode
+ */
+PARCEWMA *parcEWMA_Acquire(const PARCEWMA *instance);
+
+#ifdef PARCLibrary_DISABLE_VALIDATION
+#  define parcEWMA_OptionalAssertValid(_instance_)
+#else
+#  define parcEWMA_OptionalAssertValid(_instance_) parcEWMA_AssertValid(_instance_)
+#endif
+
+/**
+ * Assert that the given `PARCEWMA` instance is valid.
+ *
+ * @param [in] instance A pointer to a valid PARCEWMA instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     parcEWMA_AssertValid(a);
+ *
+ *     printf("Instance is valid.\n");
+ *
+ *     parcEWMA_Release(&b);
+ * }
+ * @endcode
+ */
+void parcEWMA_AssertValid(const PARCEWMA *instance);
+
+/**
+ * Create an instance of PARCEWMA
+ *
+ * The coefficient represents  a constant smoothing factor affecting
+ * the degree of prior samples to be applied upon each new update.
+ * Typically the the coefficient is _0 < coefficient < 1.0_.
+ * A higher coefficient discounts older observations faster.
+ *
+ * @return non-NULL A pointer to a valid PARCEWMA instance.
+ * @return NULL An error occurred.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     parcEWMA_Release(&a);
+ * }
+ * @endcode
+ */
+PARCEWMA *parcEWMA_Create(double coefficient);
+
+/**
+ * Compares @p instance with @p other for order.
+ *
+ * Returns a negative integer, zero, or a positive integer as @p instance
+ * is less than, equal to, or greater than @p other.
+ *
+ * @param [in] instance A pointer to a valid PARCEWMA instance.
+ * @param [in] other A pointer to a valid PARCEWMA instance.
+ *
+ * @return <0 Instance is less than @p other.
+ * @return 0 Instance a and instance b compare the same.
+ * @return >0 Instance a is greater than instance b.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *     PARCEWMA *b = parcEWMA_Create(0.75);
+ *
+ *     if (parcEWMA_Compare(a, b) == 0) {
+ *         printf("Instances are equal.\n");
+ *     }
+ *
+ *     parcEWMA_Release(&a);
+ *     parcEWMA_Release(&b);
+ * }
+ * @endcode
+ *
+ * @see parcEWMA_Equals
+ */
+int parcEWMA_Compare(const PARCEWMA *instance, const PARCEWMA *other);
+
+/**
+ * Create an independent copy the given `PARCBuffer`
+ *
+ * A new buffer is created as a complete copy of the original.
+ *
+ * @param [in] original A pointer to a valid PARCEWMA instance.
+ *
+ * @return NULL Memory could not be allocated.
+ * @return non-NULL A pointer to a new `PARCEWMA` instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     PARCEWMA *copy = parcEWMA_Copy(&b);
+ *
+ *     parcEWMA_Release(&b);
+ *     parcEWMA_Release(&copy);
+ * }
+ * @endcode
+ */
+PARCEWMA *parcEWMA_Copy(const PARCEWMA *original);
+
+/**
+ * Print a human readable representation of the given `PARCEWMA`.
+ *
+ * @param [in] instance A pointer to a valid PARCEWMA instance.
+ * @param [in] indentation The indentation level to use for printing.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     parcEWMA_Display(a, 0);
+ *
+ *     parcEWMA_Release(&a);
+ * }
+ * @endcode
+ */
+void parcEWMA_Display(const PARCEWMA *instance, int indentation);
+
+/**
+ * Determine if two `PARCEWMA` instances are equal.
+ *
+ * The following equivalence relations on non-null `PARCEWMA` instances are maintained: *
+ *   * It is reflexive: for any non-null reference value x, `parcEWMA_Equals(x, x)` must return true.
+ *
+ *   * It is symmetric: for any non-null reference values x and y, `parcEWMA_Equals(x, y)` must return true if and only if
+ *        `parcEWMA_Equals(y x)` returns true.
+ *
+ *   * It is transitive: for any non-null reference values x, y, and z, if
+ *        `parcEWMA_Equals(x, y)` returns true and
+ *        `parcEWMA_Equals(y, z)` returns true,
+ *        then `parcEWMA_Equals(x, z)` must return true.
+ *
+ *   * It is consistent: for any non-null reference values x and y, multiple invocations of `parcEWMA_Equals(x, y)`
+ *         consistently return true or consistently return false.
+ *
+ *   * For any non-null reference value x, `parcEWMA_Equals(x, NULL)` must return false.
+ *
+ * @param [in] x A pointer to a valid PARCEWMA instance.
+ * @param [in] y A pointer to a valid PARCEWMA instance.
+ *
+ * @return true The instances x and y are equal.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *     PARCEWMA *b = parcEWMA_Create(0.75);
+ *
+ *     if (parcEWMA_Equals(a, b)) {
+ *         printf("Instances are equal.\n");
+ *     }
+ *
+ *     parcEWMA_Release(&a);
+ *     parcEWMA_Release(&b);
+ * }
+ * @endcode
+ * @see parcEWMA_HashCode
+ */
+bool parcEWMA_Equals(const PARCEWMA *x, const PARCEWMA *y);
+
+/**
+ * Returns a hash code value for the given instance.
+ *
+ * The general contract of `HashCode` is:
+ *
+ * Whenever it is invoked on the same instance more than once during an execution of an application,
+ * the `HashCode` function must consistently return the same value,
+ * provided no information used in a corresponding comparisons on the instance is modified.
+ *
+ * This value need not remain consistent from one execution of an application to another execution of the same application.
+ * If two instances are equal according to the {@link parcEWMA_Equals} method,
+ * then calling the {@link parcEWMA_HashCode} method on each of the two instances must produce the same integer result.
+ *
+ * It is not required that if two instances are unequal according to the
+ * {@link parcEWMA_Equals} function,
+ * then calling the `parcEWMA_HashCode`
+ * method on each of the two objects must produce distinct integer results.
+ *
+ * @param [in] instance A pointer to a valid PARCEWMA instance.
+ *
+ * @return The hashcode for the given instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     PARCHashCode hashValue = parcEWMA_HashCode(buffer);
+ *     parcEWMA_Release(&a);
+ * }
+ * @endcode
+ */
+PARCHashCode parcEWMA_HashCode(const PARCEWMA *instance);
+
+/**
+ * Determine if an instance of `PARCEWMA` is valid.
+ *
+ * Valid means the internal state of the type is consistent with its required current or future behaviour.
+ * This may include the validation of internal instances of types.
+ *
+ * @param [in] instance A pointer to a valid PARCEWMA instance.
+ *
+ * @return true The instance is valid.
+ * @return false The instance is not valid.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     if (parcEWMA_IsValid(a)) {
+ *         printf("Instance is valid.\n");
+ *     }
+ *
+ *     parcEWMA_Release(&a);
+ * }
+ * @endcode
+ *
+ */
+bool parcEWMA_IsValid(const PARCEWMA *instance);
+
+/**
+ * Release a previously acquired reference to the given `PARCEWMA` instance,
+ * decrementing the reference count for the instance.
+ *
+ * The pointer to the instance is set to NULL as a side-effect of this function.
+ *
+ * If the invocation causes the last reference to the instance to be released,
+ * the instance is deallocated and the instance's implementation will perform
+ * additional cleanup and release other privately held references.
+ *
+ * @param [in,out] instancePtr A pointer to a pointer to the instance to release.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     parcEWMA_Release(&a);
+ * }
+ * @endcode
+ */
+void parcEWMA_Release(PARCEWMA **instancePtr);
+
+/**
+ * Create a `PARCJSON` instance (representation) of the given object.
+ *
+ * @param [in] instance A pointer to a valid PARCEWMA instance.
+ *
+ * @return NULL Memory could not be allocated to contain the `PARCJSON` instance.
+ * @return non-NULL An allocated C string that must be deallocated via parcMemory_Deallocate().
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     PARCJSON *json = parcEWMA_ToJSON(a);
+ *
+ *     char *cString = parcJSON_ToString(json);
+ *     printf("JSON representation: %s\n", cString);
+ *
+ *     parcMemory_Deallocate(&string);
+ *     parcJSON_Release(&json);
+ *
+ *     parcEWMA_Release(&a);
+ * }
+ * @endcode
+ */
+PARCJSON *parcEWMA_ToJSON(const PARCEWMA *instance);
+
+/**
+ * Produce a null-terminated string representation of the specified `PARCEWMA`.
+ *
+ * The result must be freed by the caller via {@link parcMemory_Deallocate}.
+ *
+ * @param [in] instance A pointer to a valid PARCEWMA instance.
+ *
+ * @return NULL Cannot allocate memory.
+ * @return non-NULL A pointer to an allocated, null-terminated C string that must be deallocated via {@link parcMemory_Deallocate}.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *a = parcEWMA_Create(0.75);
+ *
+ *     char *string = parcEWMA_ToString(a);
+ *
+ *     parcEWMA_Release(&a);
+ *
+ *     parcMemory_Deallocate(&string);
+ * }
+ * @endcode
+ *
+ * @see parcEWMA_Display
+ */
+char *parcEWMA_ToString(const PARCEWMA *instance);
+
+/**
+ * Update the given `PARCEWMA` filter.
+ *
+ * The value of the filter is modified by the input of an updated value
+ *
+ * @param [in] ewma A pointer to a valid `PARCEWMA` instance.
+ *
+ * @return The current exponentitally smoothed value of the filter.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *ewma = parcEWMA_Create(0.75);
+ *
+ *     for (uint64_t i = 0; i < 10; i++) {
+ *         parcEWMA_Update(ewma, i);
+ *     }
+ *
+ *     int64_t smoothedValue = parcEWMA_GetValue(ewma);
+ *
+ *     parcEWMA_Release(&ewma);
+ * }
+ * @endcode
+ */
+int64_t parcEWMA_Update(PARCEWMA *ewma, const int64_t value);
+
+/**
+ * Get the current exponentitally smoothed value of the filter.
+ *
+ * @param [in] ewma A pointer to a valid `PARCEWMA` instance.
+ *
+ * @return The current exponentitally smoothed value of the filter.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCEWMA *ewma = parcEWMA_Create(0.75);
+ *
+ *     for (uint64_t i = 0; i < 10; i++) {
+ *         parcEWMA_Update(ewma, i);
+ *     }
+ *
+ *     int64_t smoothedValue = parcEWMA_GetValue(ewma);
+ *
+ *     parcEWMA_Release(&ewma);
+ * }
+ * @endcode
+ */
+int64_t parcEWMA_GetValue(const PARCEWMA *ewma);
+#endif
diff --git a/libparc/parc/statistics/test/CMakeLists.txt b/libparc/parc/statistics/test/CMakeLists.txt
new file mode 100644
index 00000000..fde78d5b
--- /dev/null
+++ b/libparc/parc/statistics/test/CMakeLists.txt
@@ -0,0 +1,14 @@
+set(TestsExpectedToPass
+  test_parc_BasicStats
+  test_parc_EWMA
+  )
+
+# Enable gcov output for the tests
+add_definitions(--coverage)
+set(CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} " --coverage")
+
+foreach(test ${TestsExpectedToPass})
+   AddTest(${test})
+endforeach()
+
+
diff --git a/libparc/parc/statistics/test/test_parc_BasicStats.c b/libparc/parc/statistics/test/test_parc_BasicStats.c
new file mode 100644
index 00000000..129e8317
--- /dev/null
+++ b/libparc/parc/statistics/test/test_parc_BasicStats.c
@@ -0,0 +1,246 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ */
+#include "../parc_BasicStats.c"
+
+#include <inttypes.h>
+#include <math.h>
+
+#include <LongBow/testing.h>
+#include <LongBow/debugging.h>
+#include <parc/algol/parc_Memory.h>
+#include <parc/algol/parc_SafeMemory.h>
+#include <parc/algol/parc_DisplayIndented.h>
+
+#include <parc/testing/parc_MemoryTesting.h>
+#include <parc/testing/parc_ObjectTesting.h>
+
+LONGBOW_TEST_RUNNER(parc_BasicStats)
+{
+    // The following Test Fixtures will run their corresponding Test Cases.
+    // Test Fixtures are run in the order specified, but all tests should be idempotent.
+    // Never rely on the execution order of tests or share state between them.
+    LONGBOW_RUN_TEST_FIXTURE(CreateAcquireRelease);
+    LONGBOW_RUN_TEST_FIXTURE(Object);
+    LONGBOW_RUN_TEST_FIXTURE(Specialization);
+}
+
+// The Test Runner calls this function once before any Test Fixtures are run.
+LONGBOW_TEST_RUNNER_SETUP(parc_BasicStats)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+// The Test Runner calls this function once after all the Test Fixtures are run.
+LONGBOW_TEST_RUNNER_TEARDOWN(parc_BasicStats)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_FIXTURE(CreateAcquireRelease)
+{
+    LONGBOW_RUN_TEST_CASE(CreateAcquireRelease, CreateRelease);
+}
+
+LONGBOW_TEST_FIXTURE_SETUP(CreateAcquireRelease)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_FIXTURE_TEARDOWN(CreateAcquireRelease)
+{
+    if (!parcMemoryTesting_ExpectedOutstanding(0, "%s leaked memory.", longBowTestCase_GetFullName(testCase))) {
+        return LONGBOW_STATUS_MEMORYLEAK;
+    }
+
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_CASE(CreateAcquireRelease, CreateRelease)
+{
+    PARCBasicStats *instance = parcBasicStats_Create();
+    assertNotNull(instance, "Expected non-null result from parcBasicStats_Create();");
+
+    parcObjectTesting_AssertAcquireReleaseContract(parcBasicStats_Acquire, instance);
+
+    parcBasicStats_Release(&instance);
+    assertNull(instance, "Expected null result from parcBasicStats_Release();");
+}
+
+LONGBOW_TEST_FIXTURE(Object)
+{
+    LONGBOW_RUN_TEST_CASE(Object, parcBasicStats_Compare);
+    LONGBOW_RUN_TEST_CASE(Object, parcBasicStats_Copy);
+    LONGBOW_RUN_TEST_CASE(Object, parcBasicStats_Display);
+    LONGBOW_RUN_TEST_CASE(Object, parcBasicStats_Equals);
+    LONGBOW_RUN_TEST_CASE(Object, parcBasicStats_HashCode);
+    LONGBOW_RUN_TEST_CASE(Object, parcBasicStats_IsValid);
+    LONGBOW_RUN_TEST_CASE(Object, parcBasicStats_ToJSON);
+    LONGBOW_RUN_TEST_CASE(Object, parcBasicStats_ToString);
+}
+
+LONGBOW_TEST_FIXTURE_SETUP(Object)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_FIXTURE_TEARDOWN(Object)
+{
+    if (!parcMemoryTesting_ExpectedOutstanding(0, "%s mismanaged memory.", longBowTestCase_GetFullName(testCase))) {
+        return LONGBOW_STATUS_MEMORYLEAK;
+    }
+
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_CASE(Object, parcBasicStats_Compare)
+{
+    testUnimplemented("");
+}
+
+LONGBOW_TEST_CASE(Object, parcBasicStats_Copy)
+{
+    PARCBasicStats *instance = parcBasicStats_Create();
+    PARCBasicStats *copy = parcBasicStats_Copy(instance);
+    assertTrue(parcBasicStats_Equals(instance, copy), "Expected the copy to be equal to the original");
+
+    parcBasicStats_Release(&instance);
+    parcBasicStats_Release(&copy);
+}
+
+LONGBOW_TEST_CASE(Object, parcBasicStats_Display)
+{
+    PARCBasicStats *instance = parcBasicStats_Create();
+    parcBasicStats_Display(instance, 0);
+    parcBasicStats_Release(&instance);
+}
+
+LONGBOW_TEST_CASE(Object, parcBasicStats_Equals)
+{
+    PARCBasicStats *x = parcBasicStats_Create();
+    PARCBasicStats *y = parcBasicStats_Create();
+    PARCBasicStats *z = parcBasicStats_Create();
+
+    parcObjectTesting_AssertEquals(x, y, z, NULL);
+
+    parcBasicStats_Release(&x);
+    parcBasicStats_Release(&y);
+    parcBasicStats_Release(&z);
+}
+
+LONGBOW_TEST_CASE(Object, parcBasicStats_HashCode)
+{
+    PARCBasicStats *x = parcBasicStats_Create();
+    PARCBasicStats *y = parcBasicStats_Create();
+
+    parcObjectTesting_AssertHashCode(x, y);
+
+    parcBasicStats_Release(&x);
+    parcBasicStats_Release(&y);
+}
+
+LONGBOW_TEST_CASE(Object, parcBasicStats_IsValid)
+{
+    PARCBasicStats *instance = parcBasicStats_Create();
+    assertTrue(parcBasicStats_IsValid(instance), "Expected parcBasicStats_Create to result in a valid instance.");
+
+    parcBasicStats_Release(&instance);
+    assertFalse(parcBasicStats_IsValid(instance), "Expected parcBasicStats_Release to result in an invalid instance.");
+}
+
+LONGBOW_TEST_CASE(Object, parcBasicStats_ToJSON)
+{
+    PARCBasicStats *instance = parcBasicStats_Create();
+
+    PARCJSON *json = parcBasicStats_ToJSON(instance);
+
+    parcJSON_Release(&json);
+
+    parcBasicStats_Release(&instance);
+}
+
+LONGBOW_TEST_CASE(Object, parcBasicStats_ToString)
+{
+    PARCBasicStats *instance = parcBasicStats_Create();
+
+    char *string = parcBasicStats_ToString(instance);
+
+    assertNotNull(string, "Expected non-NULL result from parcBasicStats_ToString");
+
+    parcMemory_Deallocate((void **) &string);
+    parcBasicStats_Release(&instance);
+}
+
+LONGBOW_TEST_FIXTURE(Specialization)
+{
+    LONGBOW_RUN_TEST_CASE(Specialization, parcBasicStats_Update);
+}
+
+LONGBOW_TEST_FIXTURE_SETUP(Specialization)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_FIXTURE_TEARDOWN(Specialization)
+{
+    if (!parcMemoryTesting_ExpectedOutstanding(0, "%s mismanaged memory.", longBowTestCase_GetFullName(testCase))) {
+        return LONGBOW_STATUS_MEMORYLEAK;
+    }
+
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_CASE(Specialization, parcBasicStats_Update)
+{
+    PARCBasicStats *stats = parcBasicStats_Create();
+
+    parcBasicStats_Update(stats, 1);
+    parcBasicStats_Update(stats, 2);
+    parcBasicStats_Update(stats, 3);
+    parcBasicStats_Update(stats, 4);
+    parcBasicStats_Update(stats, 5);
+    parcBasicStats_Update(stats, 6);
+    parcBasicStats_Update(stats, 7);
+    parcBasicStats_Update(stats, 8);
+    parcBasicStats_Update(stats, 9);
+    parcBasicStats_Update(stats, 10);
+
+    double expected = 5.500;
+    double actual = parcBasicStats_Mean(stats);
+    assertTrue(fabs(actual - expected) < 0.001, "Expected %lf actual %lf", expected, actual);
+
+    expected = 8.25;
+    double variance = parcBasicStats_Variance(stats);
+    assertTrue(fabs(variance - expected) < 0.01, "Expected %lf actual %lf", expected, variance);
+
+    expected = 2.872;
+    double stddev = parcBasicStats_StandardDeviation(stats);
+    assertTrue(fabs(stddev - expected) < 0.001, "Expected %lf actual %lf", expected, stddev);
+
+    parcBasicStats_Release(&stats);
+}
+
+int
+main(int argc, char *argv[argc])
+{
+    LongBowRunner *testRunner = LONGBOW_TEST_RUNNER_CREATE(parc_BasicStats);
+    int exitStatus = longBowMain(argc, argv, testRunner, NULL);
+    longBowTestRunner_Destroy(&testRunner);
+    exit(exitStatus);
+}
+
+
diff --git a/libparc/parc/statistics/test/test_parc_EWMA.c b/libparc/parc/statistics/test/test_parc_EWMA.c
new file mode 100644
index 00000000..689f4704
--- /dev/null
+++ b/libparc/parc/statistics/test/test_parc_EWMA.c
@@ -0,0 +1,257 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ */
+#include "../parc_EWMA.c"
+#include <stdio.h>
+#include <inttypes.h>
+
+#include <LongBow/testing.h>
+#include <LongBow/debugging.h>
+#include <parc/algol/parc_Memory.h>
+#include <parc/algol/parc_SafeMemory.h>
+#include <parc/algol/parc_DisplayIndented.h>
+
+#include <parc/testing/parc_MemoryTesting.h>
+#include <parc/testing/parc_ObjectTesting.h>
+
+LONGBOW_TEST_RUNNER(parc_EWMA)
+{
+    // The following Test Fixtures will run their corresponding Test Cases.
+    // Test Fixtures are run in the order specified, but all tests should be idempotent.
+    // Never rely on the execution order of tests or share state between them.
+    LONGBOW_RUN_TEST_FIXTURE(CreateAcquireRelease);
+    LONGBOW_RUN_TEST_FIXTURE(Object);
+    LONGBOW_RUN_TEST_FIXTURE(Specialization);
+}
+
+// The Test Runner calls this function once before any Test Fixtures are run.
+LONGBOW_TEST_RUNNER_SETUP(parc_EWMA)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+// The Test Runner calls this function once after all the Test Fixtures are run.
+LONGBOW_TEST_RUNNER_TEARDOWN(parc_EWMA)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_FIXTURE(CreateAcquireRelease)
+{
+    LONGBOW_RUN_TEST_CASE(CreateAcquireRelease, CreateRelease);
+}
+
+LONGBOW_TEST_FIXTURE_SETUP(CreateAcquireRelease)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_FIXTURE_TEARDOWN(CreateAcquireRelease)
+{
+    if (!parcMemoryTesting_ExpectedOutstanding(0, "%s leaked memory.", longBowTestCase_GetFullName(testCase))) {
+        return LONGBOW_STATUS_MEMORYLEAK;
+    }
+
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_CASE(CreateAcquireRelease, CreateRelease)
+{
+    PARCEWMA *instance = parcEWMA_Create(0.75);
+    assertNotNull(instance, "Expected non-null result from parcEWMA_Create();");
+
+    parcObjectTesting_AssertAcquireReleaseContract(parcEWMA_Acquire, instance);
+
+    parcEWMA_Release(&instance);
+    assertNull(instance, "Expected null result from parcEWMA_Release();");
+}
+
+LONGBOW_TEST_FIXTURE(Object)
+{
+    LONGBOW_RUN_TEST_CASE(Object, parcEWMA_Compare);
+    LONGBOW_RUN_TEST_CASE(Object, parcEWMA_Copy);
+    LONGBOW_RUN_TEST_CASE(Object, parcEWMA_Display);
+    LONGBOW_RUN_TEST_CASE(Object, parcEWMA_Equals);
+    LONGBOW_RUN_TEST_CASE(Object, parcEWMA_HashCode);
+    LONGBOW_RUN_TEST_CASE(Object, parcEWMA_IsValid);
+    LONGBOW_RUN_TEST_CASE(Object, parcEWMA_ToJSON);
+    LONGBOW_RUN_TEST_CASE(Object, parcEWMA_ToString);
+}
+
+LONGBOW_TEST_FIXTURE_SETUP(Object)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_FIXTURE_TEARDOWN(Object)
+{
+    if (!parcMemoryTesting_ExpectedOutstanding(0, "%s mismanaged memory.", longBowTestCase_GetFullName(testCase))) {
+        return LONGBOW_STATUS_MEMORYLEAK;
+    }
+
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_CASE(Object, parcEWMA_Compare)
+{
+    PARCEWMA *ewma = parcEWMA_Create(0.75);
+    PARCEWMA *lesser = parcEWMA_Create(0.75);
+    PARCEWMA *greater = parcEWMA_Create(0.75);
+
+    parcEWMA_Update(ewma, 5);
+    parcEWMA_Update(lesser, 1);
+    parcEWMA_Update(greater, 10);
+
+    parcObjectTesting_AssertCompareToImpl((PARCObjectCompare *) parcEWMA_Compare,
+                                          ewma,
+                                          (const void *[]) { ewma, NULL },
+                                          (const void *[]) { lesser, NULL },
+                                          (const void *[]) { greater, NULL });
+
+    parcEWMA_Release(&ewma);
+    parcEWMA_Release(&lesser);
+    parcEWMA_Release(&greater);
+}
+
+LONGBOW_TEST_CASE(Object, parcEWMA_Copy)
+{
+    PARCEWMA *instance = parcEWMA_Create(0.75);
+    PARCEWMA *copy = parcEWMA_Copy(instance);
+    assertTrue(parcEWMA_Equals(instance, copy), "Expected the copy to be equal to the original");
+
+    parcEWMA_Release(&instance);
+    parcEWMA_Release(&copy);
+}
+
+LONGBOW_TEST_CASE(Object, parcEWMA_Display)
+{
+    PARCEWMA *instance = parcEWMA_Create(0.75);
+    parcEWMA_Display(instance, 0);
+    parcEWMA_Release(&instance);
+}
+
+LONGBOW_TEST_CASE(Object, parcEWMA_Equals)
+{
+    PARCEWMA *x = parcEWMA_Create(0.75);
+    PARCEWMA *y = parcEWMA_Create(0.75);
+    PARCEWMA *z = parcEWMA_Create(0.75);
+
+    parcObjectTesting_AssertEquals(x, y, z, NULL);
+
+    parcEWMA_Release(&x);
+    parcEWMA_Release(&y);
+    parcEWMA_Release(&z);
+}
+
+LONGBOW_TEST_CASE(Object, parcEWMA_HashCode)
+{
+    PARCEWMA *x = parcEWMA_Create(0.75);
+    PARCEWMA *y = parcEWMA_Create(0.75);
+
+    parcObjectTesting_AssertHashCode(x, y);
+
+    parcEWMA_Release(&x);
+    parcEWMA_Release(&y);
+}
+
+LONGBOW_TEST_CASE(Object, parcEWMA_IsValid)
+{
+    PARCEWMA *instance = parcEWMA_Create(0.75);
+    assertTrue(parcEWMA_IsValid(instance), "Expected parcEWMA_Create to result in a valid instance.");
+
+    parcEWMA_Release(&instance);
+    assertFalse(parcEWMA_IsValid(instance), "Expected parcEWMA_Release to result in an invalid instance.");
+}
+
+LONGBOW_TEST_CASE(Object, parcEWMA_ToJSON)
+{
+    PARCEWMA *instance = parcEWMA_Create(0.75);
+
+    PARCJSON *json = parcEWMA_ToJSON(instance);
+
+    parcJSON_Release(&json);
+
+    parcEWMA_Release(&instance);
+}
+
+LONGBOW_TEST_CASE(Object, parcEWMA_ToString)
+{
+    PARCEWMA *instance = parcEWMA_Create(0.75);
+
+    char *string = parcEWMA_ToString(instance);
+
+    assertNotNull(string, "Expected non-NULL result from parcEWMA_ToString");
+
+    parcMemory_Deallocate((void **) &string);
+    parcEWMA_Release(&instance);
+}
+
+LONGBOW_TEST_FIXTURE(Specialization)
+{
+    LONGBOW_RUN_TEST_CASE(Specialization, parcEWMA_Update);
+    LONGBOW_RUN_TEST_CASE(Specialization, parcEWMA_GetValue);
+}
+
+LONGBOW_TEST_FIXTURE_SETUP(Specialization)
+{
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+LONGBOW_TEST_CASE(Specialization, parcEWMA_Update)
+{
+    PARCEWMA *instance = parcEWMA_Create(0.25);
+
+    for (int64_t i = 0; i < 100; i++) {
+        int64_t value = parcEWMA_Update(instance, i);
+        printf("%" PRId64 " %" PRId64 " %" PRId64 "\n", value, i, value - i);
+    }
+
+    parcEWMA_Release(&instance);
+}
+
+LONGBOW_TEST_CASE(Specialization, parcEWMA_GetValue)
+{
+    PARCEWMA *instance = parcEWMA_Create(0.75);
+
+    parcEWMA_Update(instance, 0);
+
+    int64_t value = parcEWMA_GetValue(instance);
+
+    assertTrue(value == 0, "Expected 0, actual %" PRId64 "", value);
+
+    parcEWMA_Release(&instance);
+}
+
+LONGBOW_TEST_FIXTURE_TEARDOWN(Specialization)
+{
+    if (!parcMemoryTesting_ExpectedOutstanding(0, "%s mismanaged memory.", longBowTestCase_GetFullName(testCase))) {
+        return LONGBOW_STATUS_MEMORYLEAK;
+    }
+
+    return LONGBOW_STATUS_SUCCEEDED;
+}
+
+int
+main(int argc, char *argv[argc])
+{
+    LongBowRunner *testRunner = LONGBOW_TEST_RUNNER_CREATE(parc_EWMA);
+    int exitStatus = longBowMain(argc, argv, testRunner, NULL);
+    longBowTestRunner_Destroy(&testRunner);
+    exit(exitStatus);
+}
+
+