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How is the 90 percentile calculated? Say I am having total
2000 transactions pumped to the system and I have 1800
passed and 200 failed. So the 90 pertile is considered from
the Passed transactions or (passed+failed) transactions?

Answer Posted / ad

90the percentile means the highest response time among the
best passed 90% of the attempts of the transaction. In your
example, the transction is passed for 1800 times. So 90% of
1800 values would be 1620 i.e. LR will take 1620 best
response times for that transaction and will report highest
among those. This in turn means (90 percentile means) 90%
of the response times are less than or equal to this
particular number.

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