# fisherCDF

The Fisher distribution, its complement, and inverse.

The F density function (also known as Snedcor's density or the variance ratio density) is the density of x = (u1/df1)/(u2/df2), where u1 and u2 are random variables having &chi;2 distributions with df1 and df2 degrees of freedom, respectively.

fisherCDF returns the area from zero to x under the F density function. The complementary function, fisherCDFR, returns the area from x to &infin; under the F density function.

The inverse of the complemented Fisher distribution, invFisherCDFR, finds the argument x such that the integral from x to infinity of the F density is equal to the given probability y.

1. double fisherCDF(double x, double df1, double df2)
double
fisherCDF
(
double x
,
double df1
,
double df2
)
2. double fisherCDFR(double x, double df1, double df2)

## Parameters

df1
Type: double

Degrees of freedom of the first variable. Must be >= 1

df2
Type: double

Degrees of freedom of the second variable. Must be >= 1

x
Type: double

Must be >= 0