Added 90th Percentile Line blog post

source/_posts/90-Percentile-Line-Jmeter-Aggregate-Report.md

+---
+title: 90 Percentile line in JMeter Aggregate Report
+date: 2016-11-21 04:56:45
+categories:
+    - Performance Testing
+tags:
+    - jmeter
+    - reporting
+---
+The 90% percentile line is where the response time fall under the smallest range of 90% and rest 10% are considered as higher values which are ignored.
+
+## Calculate
+
+1. Sort your transactions by response time
+2. Remove 10% highest time taking transaction
+3. Now the transactions left are your 90 percentile values.
+
+## Example
+
+Lets consider we fire 10 threads for a transaction which gives us values as below
+
+```
+Transaction A > 3seconds
+Transaction A > 4seconds
+Transaction A > 7seconds
+Transaction A > 2seconds
+Transaction A > 9seconds
+Transaction A > 1seconds
+Transaction A > 5seconds
+Transaction A > 8seconds
+Transaction A > 10seconds
+Transaction A > 6seconds
+```
+
+Now after sorting the above transaction we get as below
+
+```
+Transaction A > 1 seconds
+Transaction A > 2 seconds
+Transaction A > 3 seconds
+Transaction A > 4 seconds
+Transaction A > 5 seconds
+Transaction A > 6 seconds
+Transaction A > 7 seconds
+Transaction A > 8 seconds
+Transaction A > 9 seconds
+Transaction A > 10 seconds
+```
+
+Now removing the highest 10% value will pop out transaction with `10 seconds`
+
+```
+Transaction A > 1 seconds
+Transaction A > 2 seconds
+Transaction A > 3 seconds
+Transaction A > 4 seconds
+Transaction A > 5 seconds
+Transaction A > 6 seconds
+Transaction A > 7 seconds
+Transaction A > 8 seconds
+Transaction A > 9 seconds
+```
+
+Now the highest value left out is your 90th percentile value as `9 seconds`
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