Github user pmouawad commented on the issue:
https://github.com/apache/jmeter/pull/296
Thanks for your patch.
This test fails for me:
`@Test
public void testPercentagePointBug() throws Exception {
long values[] = new long[] {
10L,9L,5
Github user abalanonline commented on the issue:
https://github.com/apache/jmeter/pull/296
@FSchumacher thank you for the remark, it is fixed now
@pmouawad DescriptiveStatistics uses legacy percentile calculation method
by default, which is Linear Interpolation Third Variant C
Github user pmouawad commented on the issue:
https://github.com/apache/jmeter/pull/296
Hello @abalanonline ,
Thanks for your replies and explanations !
I am not a math expert as you seem to be, so I have few questions you may
be able to help on:
1. Thanks to your
Github user abalanonline commented on the issue:
https://github.com/apache/jmeter/pull/296
Hello @pmouawad ,
Different estimation types used by Apache Math explained
[here](https://en.wikipedia.org/wiki/Quantile#Estimating_quantiles_from_a_sample).
The use case for nearest rank
Github user Wyatts commented on the issue:
https://github.com/apache/jmeter/pull/296
FWIW, [this
article](https://analyse-it.com/blog/2013/2/quantiles-percentiles-why-so-many-ways-to-calculate-them)
has two citations in favour of defaulting to what Wikipedia calls R-8 (though
it note
Github user abalanonline commented on the issue:
https://github.com/apache/jmeter/pull/296
@Wyatts Thank you.
R-8 is good if the interpolated approach is required. But for JMeter the
R-1 is preferable because data calculated that way have a concrete
understandable meaning.
---
I
Github user pmouawad commented on the issue:
https://github.com/apache/jmeter/pull/296
Hi Team,
What shall we do ?
As per Felix note on dev mailing list, it is more an algorithm variation
than a bug.
---
If your project is set up for it, you can reply to
Am 09.05.2017 09:11, schrieb pmouawad:
Github user pmouawad commented on the issue:
https://github.com/apache/jmeter/pull/296
Hello @abalanonline ,
Thanks for your replies and explanations !
I am not a math expert as you seem to be, so I have few questions
you may be able to he
Felix>I wonder if we should change our implementation at all.
So do I.
I wish JMeter would just throw an error when user tries to calculate 90%
percentile out of 5 values =)
Felix>Note I share your thoughts on using a dedicated library but
Felix> commons-math may be overkill in terms of performan
Hi Felix,
Thanks for this precious information.
Maybe we should document what option was taken by JOrphan if you know it.
On another side, do you agree we should make percentiles / median uniform
accross JMeter ?
It seems we have at least those choices:
- commons-math we already use in Backen
Hello,
After reading further on this topic and also reading the different
comments, my position would be:
- switch everywhere to R1 (also in commons-math)
- use the PR from contributor for the median and jorphan computations
- document the change and algo somewhere
>From my understanding, tests ha
Hi,
I don't have time to read the posted links yet
But I am OK to have the same way to calculate percentiles and documented it
Antonio
2017-05-28 11:51 GMT+02:00 Philippe Mouawad :
> Hello,
> After reading further on this topic and also reading the different
> comments, my position would be:
>
Philippe>- switch everywhere to R1 (also in commons-math)
Can you please clarify why do you prefer R1?
I'm inclined to R8 (as it is recommended by R for sample quantile
calculation).
1) I think interpolation would reduce run-to-run variance.
2) Interpolation-like estimation is easier to implemen
On Wed, May 31, 2017 at 2:54 PM, Vladimir Sitnikov <
sitnikov.vladi...@gmail.com> wrote:
> Philippe>- switch everywhere to R1 (also in commons-math)
>
> Can you please clarify why do you prefer R1?
>
Because from what the reporter wrote, it looked good to me:
"If the 90% percentile is 1200 ms tha
Philippe>"If the 90% percentile is 1200 ms than that means that 90% of
tests take no more than 1200 ms"
Well, I get your point. It makes sense to keep the old approach unless
there's some data that confirms some other approach is better.
Vladimir>What I mean is R8 kind of
Vladimir> computation sh
Am 03.06.2017 um 10:55 schrieb Philippe Mouawad:
On Wed, May 31, 2017 at 2:54 PM, Vladimir Sitnikov <
sitnikov.vladi...@gmail.com> wrote:
Philippe>- switch everywhere to R1 (also in commons-math)
Can you please clarify why do you prefer R1?
Because from what the reporter wrote, it looked goo
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