##
CHISQR_CVF

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.

###
Calling Sequence

Result = CHISQR_CVF(*
P, Df*
)

###
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.

####
Df

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

###
Example

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:

6.25139