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stats/base/variancepn/accessors.js.html

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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/**
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&nbsp;
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// MODULES //
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&nbsp;
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var gsumpw = require( '@stdlib/blas/ext/base/gsumpw' ).ndarray;
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&nbsp;
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&nbsp;
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// MAIN //
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&nbsp;
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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 {Object} x - input array object
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* @param {Collection} x.data - input array data
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* @param {Array&lt;Function&gt;} x.accessors - array element accessors
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* @param {integer} stride - stride length
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* @param {integer} offset - starting index
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* @param {integer} strideX - stride length
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* @param {NonNegativeInteger} offsetX - starting index
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* @returns {number} variance
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*
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* @example
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* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
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* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
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*
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* var x = toAccessorArray( [ 1.0, -2.0, 2.0 ] );
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* var x = toAccessorArray( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
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*
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* var v = variancepn( 3, 1, arraylike2object( x ), 1, 0 );
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* // returns ~4.3333
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* var v = variancepn( 4, 1, arraylike2object( x ), 2, 1 );
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* // returns 6.25
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*/
327-
function variancepn( N, correction, x, stride, offset ) {
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function variancepn( N, correction, x, strideX, offsetX ) {
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var xbuf;
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var get;
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var sum;
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var mu;
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var M2;
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var ix;
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var M2;
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var M;
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var d;
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var n;
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var i;
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&nbsp;
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// Cache references to array data:
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// Cache reference to array data:
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xbuf = x.data;
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&nbsp;
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// Cache references to element accessors:
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// Cache a reference to the element accessor:
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get = x.accessors[ 0 ];
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sum = 0.0;
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ix = offset;
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n = N - correction;
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&nbsp;
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if ( N &lt;= 0 || n &lt;= 0 ) {
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return NaN;
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}
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if ( N === 1 || stride === 0 ) {
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if ( N === 1 || strideX === 0 ) {
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return 0.0;
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}
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&nbsp;
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// Compute the mean:
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for ( i = 0; i &lt; N; i++ ) {
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sum += get( xbuf, ix );
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ix += stride;
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}
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mu = sum / N;
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// Compute an estimate for the mean:
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mu = gsumpw( N, xbuf, strideX, offsetX ) / N;
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&nbsp;
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n = N - correction;
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ix = offsetX;
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&nbsp;
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// Compute the variance...
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M2 = 0.0;
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M = 0.0;
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// Compute the variance:
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ix = offset;
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for ( i = 0; i &lt; N; i++ ) {
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d = get( xbuf, ix ) - mu;
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M2 += d * d;
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M += d;
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}
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&nbsp;
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return ( M2 / n ) - ( ( M / N ) * ( M / n ) );
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return (M2/n) - ((M/N)*(M/n));
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}
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&nbsp;
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&nbsp;
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// EXPORTS //
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&nbsp;
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module.exports = variancepn;
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&nbsp;</pre></td></tr></table></pre>
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<div class='footer quiet pad2 space-top1 center small'>
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Code coverage generated by
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<a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
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at 2025-06-08T09:37:51.631Z
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at 2025-06-12T08:38:03.863Z
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stats/base/variancepn/coverage.ndjson

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[353,353,100,27,27,100,3,3,100,353,353,100,"cb54def983655c6bc49192ed9a7814195a353deb","2025-06-08 09:36:45 +0000"]
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[318,318,100,21,21,100,3,3,100,318,318,100,"19dd4eceea75a997fe2d21eba60387d990b3ac72","2025-06-12 08:36:22 +0000"]

stats/base/variancepn/index.html

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<div class='footer quiet pad2 space-top1 center small'>
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Code coverage generated by
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<a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
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at 2025-06-08T09:37:51.631Z
149+
at 2025-06-12T08:38:03.863Z
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</div>
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<script src="../../../../prettify.js"></script>
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<script>

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