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    @stdlib/stats-base-dists-binomial-variance
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    0.0.8 • Public • Published

    Variance

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    Binomial distribution variance.

    The variance for a binomial random variable is

    Variance for a binomial distribution.

    where n is the number of trials and p is the success probability.

    Installation

    npm install @stdlib/stats-base-dists-binomial-variance

    Usage

    var variance = require( '@stdlib/stats-base-dists-binomial-variance' );

    variance( n, p )

    Returns the variance of a binomial distribution with number of trials n and success probability p.

    var v = variance( 20, 0.1 );
    // returns 1.8
    
    v = variance( 50, 0.5 );
    // returns 12.5

    If provided NaN as any argument, the function returns NaN.

    var v = variance( NaN, 0.5 );
    // returns NaN
    
    v = variance( 20, NaN );
    // returns NaN

    If provided a number of trials n which is not a nonnegative integer, the function returns NaN.

    var v = variance( 1.5, 0.5 );
    // returns NaN
    
    v = variance( -2.0, 0.5 );
    // returns NaN

    If provided a success probability p outside of [0,1], the function returns NaN.

    var v = variance( 20, -1.0 );
    // returns NaN
    
    v = variance( 20, 1.5 );
    // returns NaN

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var variance = require( '@stdlib/stats-base-dists-binomial-variance' );
    
    var v;
    var i;
    var n;
    var p;
    
    for ( i = 0; i < 10; i++ ) {
        n = round( randu() * 100.0 );
        p = randu();
        v = variance( n, p );
        console.log( 'n: %d, p: %d, Var(X;n,p): %d', n, p.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-binomial-variance

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    76

    Version

    0.0.8

    License

    Apache-2.0

    Unpacked Size

    32.6 kB

    Total Files

    10

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser