time-to-botec/js/node_modules/@stdlib/stats/base/dists/negative-binomial/README.md

Negative Binomial

Negative binomial distribution.

Usage

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

negativeBinomial

Negative binomial distribution.

var dist = negativeBinomial;
// returns {...}

The namespace contains the following distribution functions:

• cdf( x, r, p ): negative binomial distribution cumulative distribution function.
• logpmf( x, r, p ): evaluate the natural logarithm of the probability mass function (PMF) for a negative binomial distribution.
• mgf( t, r, p ): negative binomial distribution moment-generating function (MGF).
• pmf( x, r, p ): negative binomial distribution probability mass function (PMF).
• quantile( k, r, p ): negative binomial distribution quantile function.

The namespace contains the following functions for calculating distribution properties:

• kurtosis( r, p ): negative binomial distribution excess kurtosis.
• mean( r, p ): negative binomial distribution expected value.
• mode( r, p ): negative binomial distribution mode.
• skewness( r, p ): negative binomial distribution skewness.
• stdev( r, p ): negative binomial distribution standard deviation.
• variance( r, p ): negative binomial distribution variance.

The namespace contains a constructor function for creating a negative binomial distribution object.

• NegativeBinomial( [r, p] ): negative binomial distribution constructor.

var NegativeBinomial = require( '@stdlib/stats/base/dists/negative-binomial' ).NegativeBinomial;

var dist = new NegativeBinomial( 4.0, 0.2 );

var y = dist.pmf( 4.0 );
// returns ~0.023

Examples

var objectKeys = require( '@stdlib/utils/keys' );
var negativeBinomial = require( '@stdlib/stats/base/dists/negative-binomial' );

console.log( objectKeys( negativeBinomial ) );