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data-mean.js.html
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data-mean.js.html
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<h1 class="page-title">data-mean.js</h1>
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<pre class="prettyprint source linenums"><code>// wink-statistics
// Fast and Numerically Stable Statistical Analysis Utilities.
//
// Copyright (C) 2017-18 GRAYPE Systems Private Limited
//
// This file is part of “wink-statistics”.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
// ## data
// Load accessor.
var value = require( './accessor.js' );
// Load wink helpers for validation.
var helpers = require( 'wink-helpers' );
// ### mean
/**
*
* Comuptes the mean of numbers contained in the `x` array.
* The computations are inspired by the method proposed by [B. P. Welford](http://dx.doi.org/10.1080/00401706.1962.10490022).
*
* @memberof data
* @param {array} x array containing 1 or more elements.
* @param {(string|number|function)} [accessor=undefined] required when elements of
* `x` are objects or arrays instead of numbers.
* For objects, use key (string) to access the value; in case of arrays, use
* index (number) to access the value; or it could be a function
* that extracts the value from the element passed to it.
* @return {number} mean value.
* @example
* mean( [ 2, 3, 5, 7 ] )
* // returns 4.25
* mean( [ { x: 2 }, { x: 3 }, { x: 5 }, { x: 7 } ], 'x' )
* // returns 4.25
*/
var mean = function ( x, accessor ) {
var xi;
var mean1 = 0;
if ( !helpers.array.isArray( x ) || !x.length ) {
throw Error( 'data-mean: x should be an array of length > 0, instead found: ' + JSON.stringify( x ) );
}
for ( var i = 0, imax = x.length; i < imax; i += 1 ) {
xi = value( x[ i ], accessor );
mean1 += ( xi - mean1 ) / ( i + 1 );
}
return mean1;
}; // max()
module.exports = mean;
</code></pre>
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