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# Thread: maths in Perfromance testing

1. ## maths in Perfromance testing

Hi friends,
What is the use of knowing Average, median, standard deviation in Performance Testing? How to analyze seeing the results

Regards
subbarao

2. ## Re: maths in Perfromance testing

They are statistical values that are as useful here as performance testing has a large statistical component.

HEAVILY simplified example follows:

If your response times are between 1 and 10 seconds
and your average is 5 seconds
and your standard deviation is +/- 2 seconds
then you can statistically have some confidence that 95% of the time when this event happens the response will be between 3 and 7 seconds.

With these figures you can turn to your customer and say taht in the current test configuration the system has an average response time of 5 seconds and will be no worse than 7 seconds 95% of the time.

(this example is not intended to be mathematically accurate, it was written only to illustrate the usefulness of the stats)

http://en.wikipedia.org/wiki/List_of...tistics_topics

3. ## Re: maths in Perfromance testing

To date, the link below is the best I've been able to do to consolidate that kind of mathematic information into a performance testing centric resource.

http://www.codeplex.com/PerfTestingGuide...mance%20Testers

4. ## Re: maths in Perfromance testing

Maybe off topic, as I want to ask you - Why/Do you really want to use them?
I like and I'm good at mathematics (while in school I participated even International Mathematic Olympiads).
Math is great - it allows you to describe most of characteristics of collected measures with a few numbers like average, median, standard deviation.
However I like to look at Scatter Charts and other graphs - topic well described by Scott here http://www-128.ibm.com/developerwork...rary/4257.html

5. ## Re: maths in Perfromance testing

[ QUOTE ]
Maybe off topic, as I want to ask you - Why/Do you really want to use them?

[/ QUOTE ]

I think it is important to have a thorough understanding of basic statistics as well as the ability to analyze graphs. Depending on the situation, both are very important.

6. ## Re: maths in Perfromance testing

In fact, I would have thought that unless you plan to do a bad job, statistics are absolutely essential for performance testing...

7. ## Re: maths in Perfromance testing

Martin, Corey. I was trying to answer "How to analyze seeing" average, median, standard deviation. My answer is - I never analyze using those numbers. I analyze looking at Charts: averages, percentiles, scatter, min/max, etc. This way I may not look like the smart-guru-performance tester, but at least other stakeholders (developers, managers) are able to follow my analysis.

P.S. Maybe due to my math background I simply does not notice how do I use my knowledge of statistics and experience (charts seen before) while analyzing. You gave me a great topic to think about, thanks.

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