Artillery API test for 1VU showing incorrect value for 'median' under 'http.response_time'

[akshatrastogi01]

Artillery API test for 1VU showing incorrect value for 'median' under 'http.response_time'.
Detailed report is attached.
The test was done for 1VU on Fargate.

Attributes for 'http.response_time' (ms) are:

1. min - 122
2. max - 122
3. median - 122.7
4. p95 - 122.7
5. p99 - 122.7

In noway the median should come out to be - 122.7

report.html.zip

[hassy]

Your test is making a single request, i.e. the data set only has one sample. Percentile & median calculations don't make much intuitive sense in those cases. Artillery uses DDSketch under the hood for calculating summary statistics. It's probabilistic data structure and the value you're seeing is the estimate based on a single number.

https://stats.stackexchange.com/a/193813

[akshatrastogi01]

Thanks @hassy - so I will take it as approximation deviation, that is also acceptable. Though going by maths it was not adding up. Appreciate your responding! Cheers! :)