# Finv

Finv-func

## Definition:

computes the inverse of cdf at , with parameters and .

The deviate, , associated with the lower tail probability of the distribution with and degrees of freedom is defined as the solution to

where

;

## Parameters:

- (input, double)
- the probability,, from the required F-distribution.
- (input, double)
- the degrees of freedom of the numerator variance, , must be positive ( ).
- (input, double)
- the degrees of freedom of the denominator variance, , must be positive().
- (output, double)
- the deviate,.