@stdlib/stats-base-dists-geometric-variance

0.2.1 • Public • Published

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Variance

Geometric distribution variance.

The variance for a geometric random variable is

where p is the success probability.

Installation

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

Usage

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

variance( p )

Returns the variance of a geometric distribution with success probability p.

var v = variance( 0.1 );
// returns ~90.0

v = variance( 0.5 );
// returns 2.0

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

var v = variance( NaN );
// returns NaN

v = variance( 1.5 );
// returns NaN

v = variance( -1.0 );
// 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-geometric-variance' );

var v;
var i;
var p;

for ( i = 0; i < 10; i++ ) {
p = randu();
v = variance( p );
console.log( 'p: %d, Var(X;p): %d', 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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Install

npm i @stdlib/stats-base-dists-geometric-variance

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