6.5 KiB
6.5 KiB
Gamma
Gamma distribution.
Usage
var gamma = require( '@stdlib/stats/base/dists/gamma' );
gamma
Gamma distribution.
var dist = gamma;
// returns {...}
The namespace contains the following distribution functions:
cdf( x, alpha, beta ): gamma distribution cumulative distribution function.logcdf( x, alpha, beta ): gamma distribution logarithm of cumulative distribution function (CDF).logpdf( x, alpha, beta ): gamma distribution logarithm of probability density function (PDF).mgf( t, alpha, beta ): gamma distribution moment-generating function (MGF).pdf( x, alpha, beta ): gamma distribution probability density function (PDF).quantile( p, alpha, beta ): gamma distribution quantile function.
The namespace contains the following functions for calculating distribution properties:
entropy( alpha, beta ): gamma distribution differential entropy.kurtosis( alpha, beta ): gamma distribution excess kurtosis.mean( alpha, beta ): gamma distribution expected value.mode( alpha, beta ): gamma distribution mode.skewness( alpha, beta ): gamma distribution skewness.stdev( alpha, beta ): gamma distribution standard deviation.variance( alpha, beta ): gamma distribution variance.
The namespace contains a constructor function for creating a gamma distribution object.
Gamma( [alpha, beta] ): gamma distribution constructor.
var Gamma = require( '@stdlib/stats/base/dists/gamma' ).Gamma;
var dist = new Gamma( 2.0, 4.0 );
var y = dist.cdf( 0.5 );
// returns ~0.594
Examples
var objectKeys = require( '@stdlib/utils/keys' );
var gamma = require( '@stdlib/stats/base/dists/gamma' );
console.log( objectKeys( gamma ) );