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    @stdlib/stats-base-dists-chisquare-stdev
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    0.0.7 • Public • Published

    Standard Deviation

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    Chi-squared distribution standard deviation.

    The standard deviation for a chi-squared random variable is

    Standard deviation for a chi-squared distribution.

    where k >= 0 is the degrees of freedom.

    Installation

    npm install @stdlib/stats-base-dists-chisquare-stdev

    Usage

    var stdev = require( '@stdlib/stats-base-dists-chisquare-stdev' );

    stdev( k )

    Returns the standard deviation of a chi-squared distribution with degrees of freedom k.

    var v = stdev( 9.0 );
    // returns ~4.243
    
    v = stdev( 0.5 );
    // returns 1.0

    If provided k < 0, the function returns NaN.

    var v = stdev( -1.0 );
    // returns NaN

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var stdev = require( '@stdlib/stats-base-dists-chisquare-stdev' );
    
    var k;
    var v;
    var i;
    
    for ( i = 0; i < 10; i++ ) {
        k = randu() * 20.0;
        v = stdev( k );
        console.log( 'k: %d, SD(X,k): %d', k.toFixed( 4 ), v.toFixed( 4 ) );
    }

    Notice

    This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

    For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2022. The Stdlib Authors.

    Install

    npm i @stdlib/stats-base-dists-chisquare-stdev

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    95

    Version

    0.0.7

    License

    Apache-2.0

    Unpacked Size

    40.7 kB

    Total Files

    10

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser