# @stdlib/stats-base-dists-discrete-uniform-kurtosis

0.1.1 • Public • Published

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# Kurtosis

Discrete uniform distribution excess kurtosis.

The excess kurtosis for a discrete uniform random variable with minimum support `a` and maximum support `b` is

where `n = b - a + 1`.

## Installation

`npm install @stdlib/stats-base-dists-discrete-uniform-kurtosis`

## Usage

`var kurtosis = require( '@stdlib/stats-base-dists-discrete-uniform-kurtosis' );`

#### kurtosis( a, b )

Returns the excess kurtosis of a discrete uniform distribution with parameters `a` (minimum support) and `b` (maximum support).

```var v = kurtosis( 0, 1 );
// returns -2.0

v = kurtosis( 4, 12 );
// returns ~-1.23

v = kurtosis( 2, 8 );
// returns ~-1.25```

If `a` or `b` is not an integer value, the function returns `NaN`.

```var v = kurtosis( 0.1, 2 );
// returns NaN

v = kurtosis( 0, 2.2 );
// returns NaN

v = kurtosis( NaN, 2 );
// returns NaN

v = kurtosis( 2, NaN );
// returns NaN```

If provided `a > b`, the function returns `NaN`.

```var v = kurtosis( 3, 2 );
// returns NaN

v = kurtosis( -1, -2 );
// returns NaN```

## Examples

```var randint = require( '@stdlib/random-base-discrete-uniform' );
var kurtosis = require( '@stdlib/stats-base-dists-discrete-uniform-kurtosis' );

var randa = randint.factory( 0, 10 );
var randb = randint.factory();
var a;
var b;
var v;
var i;

for ( i = 0; i < 10; i++ ) {
a = randa();
b = randb( a, a+randa() );
v = kurtosis( a, b );
console.log( 'a: %d, b: %d, Kurt(X;a,b): %d', a.toFixed( 4 ), b.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-discrete-uniform-kurtosis`

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