Usage no npm install needed!

<script type="module">
  import speedPercentile from 'https://cdn.skypack.dev/speed-percentile';
</script>

README

speed-percentile

A JavaScript utility to compute percentile speed from speed histogram.

Example:

var percentile = require('speed-percentile');

var histogram = {20: 1, 21: 1, 22: 2, 23: 3, 24: 4, 25: 5};

var speed = percentile(histogram, 0.85, 'R4');
//=> 24.52

Install

npm install speed-percentile

Test

cd to speed-percentile folder then run

npm test

Syntax

percentile

var o1 = percentile(P1, P2, P3)

Computes the p-th precentile speed from a sparse hash speed histogram.

Inputs:

param	data type	description
`P1`	associative array with integer keys	speed histogram hash `{<speed>:<count>}`
`P2`	number or array	one or more percentiles in decimal
`P3`	string	algorithm flag (optional): `'R4'`, `'R5'` (default)

Algorithms:

R4 – R's sample quantile Type 4, but with linearly interpolated lower tail
R5 – R's sample quantile Type 5, but with both tails linearly interpolated

Outputs:

output	data type	description
`o1`	number or array	corresponding speed(s) sorted in descending order