# Thread: what is 90 percent in the response time report

1. ## what is 90 percent in the response time report

Hi all,
What is exactly the meaning of the 90 percent column in the
response time in the summary report?

Thanks

2. ## Re: what is 90 percent in the response time report

<ul type="square">[*]Percentile[*]References[*]Training[/list]

3. ## Re: what is 90 percent in the response time report

Percentile ranking is another statistical tool (just like the median and the average). Like all other metrics it needs to be used under the right circumstances to be useful or relevant.

In LR, a percentile ranking of 90 for a particular transaction basically means that 90% of the transactions took less than the displayed response time.

Regards,

4. ## Re: what is 90 percent in the response time report

From HP's Knowledge Base:

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

The 90th percentile is a measure of stastical 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. Remove the top 10% instances.
3. The highest value left is the 90th percentile.

Example:
There are ten instances of transaction "t1" with the values 1,3,2,4,5,20,7,8,9,6 (in sec).
1. Sort by value -- 1,2,3,4,5,6,7,8,9,20.
2. Remove top 10 % -- remove the value "20."
3. The highest value left is the 90th percentile -- 9 is the 90th percentile value.

The 90th percentile value answers the question, "What percentage of my transactions have a response time less than or equal to the 90th percentile value?" Given the above information, here is how LoadRunner calculates the 90th percentile.

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