Inverse Chi-squared cumulative distribution function  

inv-chisquare-cdf is an alternative implementation of the jStat.chisquare.inv in the jStat package using ES6.

Install

$ npm install --save inv-chisquare-cdf

Functions

* invChiSquareCDF(probability, degreeOfFreedom)
Returns the inverse chi-square cdf with "degreeOfFreedom" for the "probability" using the Lanczos approximation.

* invRegLowGamma(p, a)
Returns the inverse of the lower regularized incomplete Gamma function evaluated at (p,a).

* regLowGamma(a, x)
Returns the lower regularized incomplete gamma function evaluated at (a,x).

* logGamma(x)
Returns the logarithm of the gamma function

Bibliography

* jStat
* Lanczos approximation
* Inverse-chi-squared distribution