diff options
Diffstat (limited to 'csit.infra.dash/app/cdash/utils/utils.py')
| -rw-r--r-- | csit.infra.dash/app/cdash/utils/utils.py | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/csit.infra.dash/app/cdash/utils/utils.py b/csit.infra.dash/app/cdash/utils/utils.py index 424456088d..68099987d2 100644 --- a/csit.infra.dash/app/cdash/utils/utils.py +++ b/csit.infra.dash/app/cdash/utils/utils.py @@ -17,6 +17,7 @@ import pandas as pd import dash_bootstrap_components as dbc +from math import sqrt from numpy import isnan from dash import dcc from datetime import datetime @@ -391,3 +392,28 @@ def get_list_group_items( ) return children + +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 * sqrt(first * first + second * second) + return (quotient - 1) * 100, std * 100 |