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    @stdlib/stats-base-dists-poisson-skewness
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    0.0.6 • Public • Published

    Skewness

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    Poisson distribution skewness.

    The skewness for a Poisson random variable is

    Skewness for a Poisson distribution.

    where λ is the mean parameter.

    Installation

    npm install @stdlib/stats-base-dists-poisson-skewness

    Usage

    var skewness = require( '@stdlib/stats-base-dists-poisson-skewness' );

    skewness( lambda )

    Returns the skewness of a Poisson distribution with mean parameter lambda.

    var v = skewness( 9.0 );
    // returns ~0.333
    
    v = skewness( 0.5 );
    // returns ~1.414

    If provided lambda <= 0, the function returns NaN.

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

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var skewness = require( '@stdlib/stats-base-dists-poisson-skewness' );
    
    var lambda;
    var v;
    var i;
    
    for ( i = 0; i < 10; i++ ) {
        lambda = randu() * 20.0;
        v = skewness( lambda );
        console.log( 'λ: %d, skew(X;λ): %d', lambda.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 © 2016-2021. The Stdlib Authors.

    Install

    npm i @stdlib/stats-base-dists-poisson-skewness

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    19

    Version

    0.0.6

    License

    Apache-2.0

    Unpacked Size

    44.1 kB

    Total Files

    10

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    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser