The CHISQR_CVF function computes the cutoff value V in a chi-square distribution with Df degrees of freedom 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 chisqr_cvf.pro in the lib subdirectory of the IDL distribution.
Result = CHISQR_CVF(P, Df)
Returns computes the cutoff value V in a chi-square distribution with Df degrees of freedom such that the probability that a random variable X is greater than V is equal to a user-supplied probability 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.
A positive integer, single- or double-precision floating-point scalar that specifies the number of degrees of freedom of the chi-square distribution.
None.
Use the following command to compute the cutoff value in a chi-square distribution with three degrees of freedom such that the probability that a random variable X is greater than the cutoff value is 0.100. The result should be 6.25139.
PRINT, CHISQR_CVF(0.100, 3)
IDL prints:
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4.0 |
Introduced |
CHISQR_PDF , F_CVF , GAUSS_CVF , T_CVF