Pavol Vaskovic a9f0ce4338 [benchmark] Fix quantile estimation type ...

The correct quantile estimation type for printing all measurements in the summary report while `quantile == num-samples - 1` is R-1, SAS-3.  It's the inverse of empirical distribution function.

References:
* https://en.wikipedia.org/wiki/Quantile#Estimating_quantiles_from_a_sample
* discussion in https://github.com/apple/swift/pull/19097#issuecomment-421238197

2018-09-20 09:19:07 +02:00

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