npmpackage.info

Gathering detailed insights and metrics for @stdlib/stats-base-dists-chi-cdf

@stdlib/stats-base-dists-chi-cdf

Chi distribution cumulative distribution function (CDF).

0.2.2

Apache-2.0

JavaScript

1,727,562 4.4

Installations

npm install @stdlib/stats-base-dists-chi-cdf

Pull Requests

Open

0

Total

0

Closed

0

Issues

Open

0

Total

0

Closed

0

Releases

Unable to fetch releases

Developer

stdlib-js

Developer Guide

BETA

Module System

CommonJS

Min. Node Version

>=0.10.0

Typescript Support

Yes

Node Version

16.20.2

NPM Version

8.19.4 Statistics

1 Stars

50 Commits

3 Watching

5 Branches

10 Contributors

Updated on 01 Nov 2024

Languages

JavaScript (100%)

Total Downloads

Cumulative downloads

Total Downloads

1,727,562

Last day

25.9%

5,808

Compared to previous day

Last week

18.5%

33,412

Compared to previous week

Last month

-4.7%

131,603

Compared to previous month

Last year

864.4%

1,552,878

Compared to previous year

Daily Downloads

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

@stdlib/math-base-assert-is-nan @stdlib/stats-base-dists-degenerate-cdf @stdlib/stats-base-dists-gamma-cdf @stdlib/utils-define-nonenumerable-read-only-property

Versions

About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

Cumulative Distribution Function

Chi distribution cumulative distribution function.

The cumulative distribution function for a chi random variable is

1F(x;\,k) = P\left(k/2,x^{2}/2\right)

where k is the degrees of freedom and P is the lower regularized incomplete gamma function.

Installation

1npm install @stdlib/stats-base-dists-chi-cdf

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

1var cdf = require( '@stdlib/stats-base-dists-chi-cdf' );

cdf( x, k )

Evaluates the cumulative distribution function (CDF) for a chi distribution with degrees of freedom k.

1var y = cdf( 2.0, 1.0 );
2// returns ~0.954
3
4y = cdf( 2.0, 3.0 );
5// returns ~0.739
6
7y = cdf( 1.0, 0.5 );
8// returns ~0.846
9
10y = cdf( -1.0, 2.0 );
11// returns 0.0
12
13y = cdf( -Infinity, 4.0 );
14// returns 0.0
15
16y = cdf( +Infinity, 4.0 );
17// returns 1.0

If provided NaN as any argument, the function returns NaN.

1var y = cdf( NaN, 1.0 );
2// returns NaN
3
4y = cdf( 0.0, NaN );
5// returns NaN

If provided k < 0, the function returns NaN.

1var y = cdf( 2.0, -2.0 );
2// returns NaN

If provided k = 0, the function evaluates the CDF of a degenerate distribution centered at 0.

1var y = cdf( 2.0, 0.0 );
2// returns 1.0
3
4y = cdf( -2.0, 0.0 );
5// returns 0.0
6
7y = cdf( 0.0, 0.0 );
8// returns 1.0

cdf.factory( k )

Returns a function for evaluating the cumulative distribution function for a chi distribution with degrees of freedom k.

1var mycdf = cdf.factory( 3.0 );
2
3var y = mycdf( 6.0 );
4// returns ~1.0
5
6y = mycdf( 1.5 );
7// returns ~0.478

Examples

1var randu = require( '@stdlib/random-base-randu' );
2var round = require( '@stdlib/math-base-special-round' );
3var cdf = require( '@stdlib/stats-base-dists-chi-cdf' );
4
5var k;
6var x;
7var y;
8var i;
9
10for ( i = 0; i < 20; i++ ) {
11    x = randu() * 10.0;
12    k = round( randu()*5.0 );
13    y = cdf( x, k );
14    console.log( 'x: %d, k: %d, F(x;k): %d', x.toFixed( 4 ), k.toFixed( 4 ), y.toFixed( 4 ) );
15}

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.

Copyright

No vulnerabilities found.

10

Binary-Artifacts

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10

Vulnerabilities

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10

Dangerous-Workflow

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10

License

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9

Security-Policy

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3

Pinned-Dependencies

Determines if the project has declared and pinned the dependencies of its build process.

Reason

dependency not pinned by hash detected -- score normalized to 3

Details

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Warn: npmCommand not pinned by hash: .github/workflows/test.yml:76
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Warn: npmCommand not pinned by hash: .github/workflows/test.yml:83
Warn: npmCommand not pinned by hash: .github/workflows/test_bundles.yml:72
Warn: npmCommand not pinned by hash: .github/workflows/test_coverage.yml:67
Warn: npmCommand not pinned by hash: .github/workflows/test_coverage.yml:67
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Info: 31 out of 31 GitHub-owned GitHubAction dependencies pinned
Info: 18 out of 23 third-party GitHubAction dependencies pinned
Info: 0 out of 31 npmCommand dependencies pinned

2

Maintained

Determines if the project is "actively maintained".

0

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

CII-Best-Practices

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0

SAST

Determines if the project uses static code analysis.

0

Token-Permissions

Determines if the project's workflows follow the principle of least privilege.

0

Fuzzing

Determines if the project uses fuzzing.

0

Branch-Protection

Determines if the default and release branches are protected with GitHub's branch protection settings.

Score

4.4

/10

Last Scanned on 2024-11-18

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