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1. ## Transaction Response Time

In Transaction response time graph of the Summary report we get
following statistics about the Transaction Response Time:

1. Minium
2. Average
3. maximum
4. Standard Deviation
5. 90 %

Can anyone please tell me which statistics out of these will simulate
the real world condition.

2. ## Re: Transaction Response Time

Without knowing usage of your system, one cannot know. ??? This is kind of an oblique question. A rough idea of real world usage can be culled from web logs, db logs, etc.

3. ## Re: Transaction Response Time

Bharat - here's one answer for you...

IF your test is accurately modeling the "real world" (with regard to business processes, transaction rates, etc...), then these numbers are ALL valid and meaningful.

What is the best response time I can expect?
What is the worst response time I can expect?
On average, what response time can I expect?
If we remove 10% of the worst response times, then what is the new worst response time I can expect (90%)?
How much of a difference is there in the above data?

4. ## Re: Transaction Response Time

Hi Laura,

Can u more eloborate on "Standard Deviation"

If the avarage and 90 percentile shows huge differnece what we can conclude?

Thanks,
sba786

5. ## Re: Transaction Response Time

Standard Deviation is a statistical term... look it up on Google or something... there's a mathematical formula for it but I can't rememember what it is - been a long time since I did any real maths

If the average and 90th percentile are massively different - have a look at the response time percentile graph - you'll probably find that 85% or so of the response times are very quick and a few are very slow

for example the following response times

1
1
1
1
1
11
1
11
1
1

would give an average of 3 but a 90th percentile of 11

look for any external factors

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