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From Geoff Simmons <ge...@uplex.de>
Subject Re: Result Average or Median
Date Wed, 22 Feb 2012 02:01:17 GMT
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On 2/21/12 9:35 PM, Bhuiyan, Hasan (Hasan) wrote:
> 
> I am running a test of 50 users. Getting example 48sec average and
> 4sec median. Which is one I should report to management?

http://en.wikipedia.org/wiki/Mode_%28statistics%29#Comparison_of_mean.2C_median_and_mode
http://en.wikipedia.org/wiki/File:Comparison_mean_median_mode.svg

It very likely means that your distribution of responses skews to the
right, a common result in performance testing. It could mean that you
have a long tail situation, which is often a bad sign about
performance. If these are web response times, and the mean is 48
seconds, I would be raising my eyebrows.

This is just basic statistics, and you'll either have to get your
management to understand it, or if that's not feasible, show them a
histogram of response times.


HTH,
Geoff
- -- 
UPLEX Systemoptimierung
Schwanenwik 24
22087 Hamburg
http://uplex.de/
Mob: +49-176-63690917
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