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.
Result = F_CVF(P, Dfn, Dfd)
Returns the cutoff value V, given a distribution F, with specified degrees of freedom in the numerator and denominator.
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.
A positive integer, single- or double-precision floating-point scalar that specifies the number of degrees of freedom of the F distribution numerator.
A positive integer, single- or double-precision floating-point scalar that specifies the number of degrees of freedom of the F distribution denominator.
None.
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)
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4.0 |
Introduced |
CHISQR_CVF , F_PDF , GAUSS_CVF , T_CVF