# @stdlib/stats-base-dists-geometric-stdev

0.2.1 • Public • Published

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# Standard Deviation

Geometric distribution standard deviation.

The standard deviation for a geometric random variable is

where `p` is the success probability.

## Installation

`npm install @stdlib/stats-base-dists-geometric-stdev`

## Usage

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

#### stdev( p )

Returns the standard deviation of a geometric distribution with success probability `p`.

```var v = stdev( 0.1 );
// returns ~9.487

v = stdev( 0.5 );
// returns ~1.414```

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

```var v = stdev( NaN );
// returns NaN

v = stdev( 1.5 );
// returns NaN

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-geometric-stdev' );

var v;
var i;
var p;

for ( i = 0; i < 10; i++ ) {
p = randu();
v = stdev( p );
console.log( 'p: %d, SD(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.

## Package Sidebar

### Install

`npm i @stdlib/stats-base-dists-geometric-stdev`

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