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From sebb <seb...@gmail.com>
Subject Re: Issues regarding analysis
Date Wed, 16 Apr 2008 06:31:51 GMT
On 16/04/2008, Vignesh Venkataraman <technovigno@gmail.com> wrote:
> Hi,
>
>  I am working on JMeter for analysis on the tool and development. In the
>  analysis, I found few issues,
>  1. Standard deviation calculated is the biased SD and not unbiased SD, why
>  is biased SD being calculated?

It uses

Math.sqrt((sumOfSquares / count) - (mean * mean))

What should it use, and why?

>  2. In case of different pages having similar components, as they are grouped
>  together in case of Listeners in JMeter, I am not able to calculate their
>  Standard Deviation. Is there any specific way in which it could be
>  calculated?

You can add Listeners as children of specific elements, but there is
no other way to control which samples they process.

>  Thanks a lot in advance
>
>  With Regards,
>
> Vignesh
>

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