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Degenerate

Degenerate distribution constructor.

Installation

npm install @stdlib/stats-base-dists-degenerate-ctor

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var Degenerate = require( '@stdlib/stats-base-dists-degenerate-ctor' );

Degenerate( [mu] )

Returns a Degenerate distribution object.

var degenerate = new Degenerate();

var mean = degenerate.mean;
// returns 0.0

By default, mu = 0.0. To create a distribution having a different mean value mu, provide a parameter value.

var degenerate = new Degenerate( 20.0 );

var mean = degenerate.mean;
// returns 20.0

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degenerate

A Degenerate distribution object has the following properties and methods...

Writable Properties

degenerate.mu

Constant value of the distribution.

var degenerate = new Degenerate( 2.0 );

var mu = degenerate.mu;
// returns 2.0

degenerate.mu = -2.0;

mu = degenerate.mu;
// returns -2.0

---

Computed Properties

Degenerate.prototype.entropy

Returns the differential entropy.

var degenerate = new Degenerate( 4.0 );

var entropy = degenerate.entropy;
// returns 0.0

Degenerate.prototype.mean

Returns the mean.

var degenerate = new Degenerate( 10.0 );

var mu = degenerate.mean;
// returns 10.0

Degenerate.prototype.median

Returns the median.

var degenerate = new Degenerate( 10.0 );

var median = degenerate.median;
// returns 10.0

Degenerate.prototype.mode

Returns the mode.

var degenerate = new Degenerate( 10.0 );

var mode = degenerate.mode;
// returns 10.0

Degenerate.prototype.stdev

Returns the standard deviation.

var degenerate = new Degenerate( 4.0 );

var s = degenerate.stdev;
// returns 0.0

Degenerate.prototype.variance

Returns the variance.

var degenerate = new Degenerate( 4.0 );

var s2 = degenerate.variance;
// returns 0.0

---

Methods

Degenerate.prototype.cdf( x )

Evaluates the cumulative distribution function (CDF).

var degenerate = new Degenerate( 0.2 );

var y = degenerate.cdf( 0.5 );
// returns 1.0

Degenerate.prototype.logcdf( x )

Evaluates the natural logarithm of the cumulative distribution function (logCDF).

var degenerate = new Degenerate( 0.2 );

var y = degenerate.logcdf( 0.5 );
// returns 0.0

Degenerate.prototype.logpdf( x )

Evaluates the natural logarithm of the probability density function (logPDF).

var degenerate = new Degenerate( 10.0 );

var y = degenerate.logpdf( 9.0 );
// returns -Infinity

y = degenerate.logpdf( 10.0 );
// returns Infinity

Degenerate.prototype.logpmf( x )

Evaluates the natural logarithm of the probability mass function (logPMF).

var degenerate = new Degenerate( 10.0 );

var y = degenerate.logpmf( 9.0 );
// returns -Infinity

y = degenerate.logpmf( 10.0 );
// returns 0.0

Degenerate.prototype.mgf( t )

Evaluates the moment-generating function (MGF).

var degenerate = new Degenerate( 10.0 );

var y = degenerate.mgf( 0.1 );
// returns ~2.718

Degenerate.prototype.pdf( x )

Evaluates the probability density function (PDF).

var degenerate = new Degenerate( 10.0 );

var y = degenerate.pdf( 2.0 );
// returns 0.0

y = degenerate.pdf( 10.0 );
// returns +Infinity

Degenerate.prototype.pmf( x )

Evaluates the probability mass function (PMF).

var degenerate = new Degenerate( 10.0 );

var y = degenerate.pmf( 2.0 );
// returns 0.0

y = degenerate.pmf( 10.0 );
// returns 1.0

Degenerate.prototype.quantile( p )

Evaluates the quantile function at probability p.

var degenerate = new Degenerate( 10.0 );

var y = degenerate.quantile( 0.5 );
// returns 10.0

y = degenerate.quantile( 0.9 );
// returns 10.0

---

Examples

var Degenerate = require( '@stdlib/stats-base-dists-degenerate-ctor' );

var degenerate = new Degenerate( 0.5 );

var mu = degenerate.mean;
// returns 0.5

var s2 = degenerate.variance;
// returns 0.0

var y = degenerate.cdf( 2.0 );
// returns 1.0

---

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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.