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.