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

    Standard Deviation

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    Binomial distribution standard deviation.

    The standard deviation for a binomial random variable is

    Standard deviation 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-stdev

    Usage

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

    stdev( n, p )

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

    var v = stdev( 20, 0.1 );
    // returns ~1.342
    
    v = stdev( 50, 0.5 );
    // returns ~3.536

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

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

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

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

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

    var v = stdev( 20, -1.0 );
    // returns NaN
    
    v = stdev( 20, 1.5 );
    // 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-binomial-stdev' );
    
    var v;
    var i;
    var n;
    var p;
    
    for ( i = 0; i < 10; i++ ) {
        n = round( randu() * 100.0 );
        p = randu();
        v = stdev( n, p );
        console.log( 'n: %d, p: %d, SD(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-stdev

    Homepage

    stdlib.io

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    91

    Version

    0.0.8

    License

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    Unpacked Size

    30.4 kB

    Total Files

    10

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    Collaborators

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