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What is 95% percentile

Unregistered User Posts: 514 2/22/2018	Unregistered User Posts: 514 I have a question related to 95% response time data in transaction detail. As per the documentation, 95% is the maximum response time after excluding the slowest 5% of transaction iterations. In the following graph, there are 20 iterations and the data given by the tool is Avg - 0.577 Min - 0.406 Median -0.406 90% - 0.844 95% - 2.923 Max - 2.923 95% and Max are the same. But if we go by the documentation 95% should exclude the slowest 5% transaction. 5% of 20 is 1. Shouldn't 95% exclude 2.93? Please help me understand.
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George @StresStimulus Administrator Posts: 568 2/22/2018	George @StresStimulus Administrator Posts: 568 “95%” percentile deals with a sequence of transaction times measured for all users and iterations. To determine this information, the followings two steps are performed: Out of all of your Transaction times exclude 5% of the slowest responses. Then take the slowest of the remaining responses. This will be the “95%” percentile. This information is available in a waterfall graph, where you can request the transaction durations for any VU and iteration. The graph that you provided, on the other hand, shows the minimum transaction time reported between the data points. For example, if your sample rate is set to 5 minutes, then your measurement of 2.93 can mean that, if during the first 5 minutes of the test let’s say 50 out of 300 VUs completed this transaction, then the slowest of these transaction times was 2.93. As you can see, the graph measurements cannot be directly converted to percentiles on the report. This graph merely indicates how transaction times change as the test was progressing.
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Unregistered User Posts: 514 2/22/2018	Unregistered User Posts: 514 Thanks for explanation. So you mean 95% value is the maximum response time of those 5% slowest responses?
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George @StresStimulus Administrator Posts: 568 2/22/2018	George @StresStimulus Administrator Posts: 568 The 95% value is the minimum response time of the slowest 5%of responses. What you are asking (the maximum response time of the slowest 5%of responses) is the slowest response.
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Unregistered User Posts: 514 2/23/2018	Unregistered User Posts: 514 Ok, so can I say that 95% means 95% of the transactions were at or under this response time?
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George @StresStimulus Administrator Posts: 568 2/23/2018	George @StresStimulus Administrator Posts: 568 Correct, 95% of the transaction times were faster than 2.92 seconds.
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