chi-squared

Characteristic functions for the chi-squared distribution.

This is a maintained fork of chi-squared.js, published as @unabandoned/chi-squared. Upstream's last release was 1.1.0 in 2014. The implementation is unchanged; its one dependency, gamma, is vendored in-tree as gamma.js, so the package has no runtime dependencies. See .unabandoned.yml.

example

> var chi = require('chi-squared')
> chi.pdf(0.5, 1)
0.4393912894677223
> chi.pdf(2.3, 1.4)
0.11695769277348175
> chi.cdf(2, 2)
0.6321204474030797

methods

var chi = require('chi-squared')

chi.pdf(x, k)

Compute the probability density function for the parameter x under k degrees of freedom.

chi.cdf(x, k)

compute the cumulative density function. same parameters as above.

install

With npm do:

npm install @unabandoned/chi-squared

To keep existing require('chi-squared') / import ... from 'chi-squared' call sites working unchanged, install it under the original name:

"chi-squared": "npm:@unabandoned/chi-squared@^1.2.0"

license

MIT