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From bugzi...@apache.org
Subject [Bug 61130] Percentile and Median : Document algorithms used
Date Sun, 28 May 2017 06:50:18 GMT
https://bz.apache.org/bugzilla/show_bug.cgi?id=61130

Philippe Mouawad <p.mouawad@ubik-ingenierie.com> changed:

           What    |Removed                     |Added
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                 CC|                            |p.mouawad@ubik-ingenierie.c
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--- Comment #4 from Philippe Mouawad <p.mouawad@ubik-ingenierie.com> ---
Hello Aleksei,
I didn't want to be rude by closing issue.
First thanks for your time, your PR and work.

I closed the PR for the following reasons:
- My understanding is that on large set of data which should be the case for
correctly ran tests, the different percentiles algorithm will lead to similar
values. "There is no standard definition of percentile,[2][3][4] however all
definitions yield similar results when the number of observations is very large
and the probability distribution is continuous"
- As per Felix note, there doesn't seem to be 1 truth
- Changing the algorithm might lead to changes in results that will trigger
potentially a lot of "false" issues.


Still maybe there is a better way of fixing the issue, SO I reopened the bugs.
It appears to me we could fix median as per your PR and use Math Percentile
setup with R_1 accross all JMeter library.

But I won't touch them myself as I have no firm opinion.

Thank you

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