# chi-squared

Characteristic functions for the
[chi-squared distribution](http://en.wikipedia.org/wiki/Chi-squared_distribution).

[![build status](https://secure.travis-ci.org/substack/chi-squared.js.png)](http://travis-ci.org/substack/chi-squared.js)

# 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](http://npmjs.org) do:

```
npm install chi-squared
```

# license

MIT