F_CVF

The F_CVF function computes the cutoff value V in an F distribution with degrees of freedom in the numerator and degrees of freedom in the denominator such that the probability that a random variable X is greater than V is equal to a user-supplied probability P.

This routine is written in the IDL language. Its source code can be found in the file f_cvf.pro in the lib subdirectory of the IDL distribution.

Examples

Use the following command to compute the cutoff value in an F distribution with ten degrees of freedom in the numerator and six degrees of freedom in the denominator such that the probability that a random variable X is greater than the cutoff value is 0.01. The result should be 7.87413:

PRINT, F_CVF(0.01, 10, 6)

Syntax

Result = F_CVF(P, Dfn, Dfd)

Return Value

Returns the cutoff value V, given a distribution F, with specified degrees of freedom in the numerator and denominator.

Arguments

P

A non-negative single- or double-precision floating-point scalar, in the interval [0.0, 1.0], that specifies the probability of occurrence or success.

Dfn

A positive integer, single- or double-precision floating-point scalar that specifies the number of degrees of freedom of the F distribution numerator.

Dfd

A positive integer, single- or double-precision floating-point scalar that specifies the number of degrees of freedom of the F distribution denominator.

Keywords

None.

Version History

4.0	Introduced