115 lines
2.8 KiB
JavaScript
115 lines
2.8 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2020 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
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// MAIN //
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/**
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* Computes the variance of a single-precision floating-point strided array ignoring `NaN` values and using a one-pass algorithm proposed by Youngs and Cramer.
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*
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* ## Method
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*
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* - This implementation uses a one-pass algorithm, as proposed by Youngs and Cramer (1971).
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*
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* ## References
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*
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* - Youngs, Edward A., and Elliot M. Cramer. 1971. "Some Results Relevant to Choice of Sum and Sum-of-Product Algorithms." _Technometrics_ 13 (3): 657–65. doi:[10.1080/00401706.1971.10488826](https://doi.org/10.1080/00401706.1971.10488826).
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*
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* @param {PositiveInteger} N - number of indexed elements
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* @param {number} correction - degrees of freedom adjustment
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* @param {Float32Array} x - input array
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* @param {integer} stride - stride length
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* @param {NonNegativeInteger} offset - starting index
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* @returns {number} variance
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*
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* @example
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* var Float32Array = require( '@stdlib/array/float32' );
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* var floor = require( '@stdlib/math/base/special/floor' );
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*
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* var x = new Float32Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0, NaN, NaN ] );
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* var N = floor( x.length / 2 );
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*
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* var v = snanvarianceyc( N, 1, x, 2, 1 );
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* // returns 6.25
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*/
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function snanvarianceyc( N, correction, x, stride, offset ) {
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var sum;
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var ix;
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var nc;
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var S;
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var v;
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var d;
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var n;
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var i;
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if ( N <= 0 ) {
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return NaN;
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}
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if ( N === 1 || stride === 0 ) {
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v = x[ offset ];
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if ( v === v && N-correction > 0.0 ) {
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return 0.0;
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}
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return NaN;
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}
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ix = offset;
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// Find the first non-NaN element...
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for ( i = 0; i < N; i++ ) {
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v = x[ ix ];
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if ( v === v ) {
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break;
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}
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ix += stride;
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}
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if ( i === N ) {
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return NaN;
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}
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ix += stride;
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sum = v;
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S = 0.0;
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i += 1;
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n = 1;
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for ( i; i < N; i++ ) {
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v = x[ ix ];
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if ( v === v ) {
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n += 1;
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sum = float64ToFloat32( sum + v );
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d = float64ToFloat32( float64ToFloat32(n*v) - sum );
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S = float64ToFloat32( S + float64ToFloat32( float64ToFloat32( float64ToFloat32(1.0/(n*(n-1))) * d ) * d ) ); // eslint-disable-line max-len
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}
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ix += stride;
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}
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nc = n - correction;
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if ( nc <= 0.0 ) {
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return NaN;
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}
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return float64ToFloat32( S / nc );
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}
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// EXPORTS //
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module.exports = snanvarianceyc;
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