Thursday, 9 February 2012

90th percentile Response time Loadrunner analysis report


The 90th percentile is the value for which 90% of the data points are smaller.

The 90th percentile is a measure of statistical distribution, not unlike the median. The median is the middle value. The median is the value for which 50% of the values were bigger, and 50% smaller. The 90th percentile tells you the value for which 90% of the data points are smaller and 10% are bigger.
Statistically, to calculate the 90th percentile value:
1. Sort the transaction instances by their value.
2. Count the total number of transactions (Let that be T).
3. Calculate 90/100 * T = Position (P)
4. This calculated position (P) contains the 90th percentile value (V).

Example:
There are certain instances of transaction "t1" with the values 1,3,2,4,5,20,7,8,11,6 (in sec).
1. Sort by value -- 1,2,3,4,5,6,7,8,11,20.
2. Count the total number of transactions; T= 10;
3. Calculate 90/100 * 10 = 9; Here P = 9.
4. Position 9 contains the 90th percentile value =11; V=11.

This 90th percentile value is considered as the benchmark.



I love Loadrunner 

29 comments:

  1. How to calculate the 90th Percentile if the number of transactions is not a multiple of 10?

    ReplyDelete
  2. This is a good example to explain the 90% percentile concept.

    ReplyDelete
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