README

logit

$NPM version$ $Build Status$ $Coverage Status$ $dependencies$

Compute the logit function.

The logit function is defined as the logarithm of the odds p / (1-p); i.e.,

$Logit function.$

The logit function is the inverse of the standard logistic function, sometimes also called the sigmoid function.

Installation

npm install @stdlib/math-base-special-logit

Usage

var logit = require( '@stdlib/math-base-special-logit' );

logit( p )

Computes the logit function.

var v = logit( 0.2 );
// returns ~-1.386

v = logit( 0.9 );
// returns ~2.197

If p < 0 or p > 1, the function returns NaN.

var v = logit( 1.3 );
// returns NaN

v = logit( -0.2 );
// returns NaN

Examples

var randu = require( '@stdlib/random-base-randu' );
var logit = require( '@stdlib/math-base-special-logit' );

var p;
var i;

for ( i = 0; i < 100; i++ ) {
    p = randu();
    console.log( 'logit(%d) = %d', p, logit( p ) );
}

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

License

See LICENSE.

@stdlib/math-base-special-logit

Usage no npm install needed!