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Diffstat (limited to 'resources/tools/presentation/utils.py')
| -rw-r--r-- | resources/tools/presentation/utils.py | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/resources/tools/presentation/utils.py b/resources/tools/presentation/utils.py index c350fae135..8f5630083b 100644 --- a/resources/tools/presentation/utils.py +++ b/resources/tools/presentation/utils.py @@ -16,6 +16,7 @@ import multiprocessing import subprocess +import math import numpy as np import logging import csv @@ -68,6 +69,32 @@ def relative_change(nr1, nr2): return float(((nr2 - nr1) / nr1) * 100) +def relative_change_stdev(mean1, mean2, std1, std2): + """Compute relative standard deviation of change of two values. + + The "1" values are the base for comparison. + Results are returned as percentage (and percentual points for stdev). + Linearized theory is used, so results are wrong for relatively large stdev. + + :param mean1: Mean of the first number. + :param mean2: Mean of the second number. + :param std1: Standard deviation estimate of the first number. + :param std2: Standard deviation estimate of the second number. + :type mean1: float + :type mean2: float + :type std1: float + :type std2: float + :returns: Relative change and its stdev. + :rtype: float + """ + mean1, mean2 = float(mean1), float(mean2) + quotient = mean2 / mean1 + first = std1 / mean1 + second = std2 / mean2 + std = quotient * math.sqrt(first * first + second * second) + return (quotient - 1) * 100, std * 100 + + def get_files(path, extension=None, full_path=True): """Generates the list of files to process. |