IceCreamYou
/ percentile.js
Last active
November 17, 2022 01:54
Utility functions to calculate percentiles and percent ranks in a JavaScript array.
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| // Returns the value at a given percentile in a sorted numeric array. | |
| // "Linear interpolation between closest ranks" method | |
| function percentile(arr, p) { | |
| if (arr.length === 0) return 0; | |
| if (typeof p !== 'number') throw new TypeError('p must be a number'); | |
| if (p <= 0) return arr[0]; | |
| if (p >= 1) return arr[arr.length - 1]; | |
| var index = (arr.length - 1) * p, | |
| lower = Math.floor(index), |
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