bh.js (1604B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2020 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var min = require( '@stdlib/math/base/special/min' ); 24 var cumin = require( './../../base/cumin' ); 25 var Float64Array = require( '@stdlib/array/float64' ); 26 var order = require( './order.js' ); 27 28 29 // MAIN // 30 31 /** 32 * Adjusts the p-values via the Benjamini-Hochberg procedure. 33 * 34 * @private 35 * @param {ProbabilityArray} pvalues - p-values to be adjusted 36 * @param {PositiveInteger} comparisons - number of comparisons 37 * @returns {ProbabilityArray} adjusted p-values 38 */ 39 function bh( pvalues, comparisons ) { 40 var indices; 41 var sorted; 42 var len; 43 var out; 44 var i; 45 46 len = pvalues.length; 47 indices = order( pvalues, true ); 48 sorted = new Float64Array( len ); 49 for ( i = 0; i < len; i++ ) { 50 sorted[ i ] = comparisons / ( len - i ) * pvalues[ indices[ i ] ]; 51 } 52 sorted = cumin( len, sorted, 1, sorted, 1 ); 53 out = new Array( len ); 54 for ( i = 0; i < len; i++ ) { 55 out[ indices[ i ] ] = min( sorted[ i ], 1.0 ); 56 } 57 return out; 58 } 59 60 61 // EXPORTS // 62 63 module.exports = bh;