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C Library Functions  - chscdf (3)

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NAME

chscdf(3f) - [M_datapac:CUMULATIVE_DISTRIBUTION] compute the chi-square cumulative distribution function

CONTENTS

Synopsis
Description
Input Arguments
Output Arguments
Examples
Author
Maintainer
License
References

SYNOPSIS

SUBROUTINE CHSCDF(X,Nu,Cdf)

       REAL(kind=wp),intent(in) :: X
       REAL(kind=wp),intent(out) :: Cdf
       INTEGER,intent(in) :: Nu

DESCRIPTION

CHSCDF(3f) computes the cumulative distribution function value for the chi-squared distribution with integer degrees of freedom parameter = NU.

This distribution is defined for all non-negative X.

The probability density function is given in the references below.

INPUT ARGUMENTS

X	The value at which the cumulative distribution function is to be evaluated. X should be non-negative.
NU	The integer number of degrees of freedom. NU should be positive.

OUTPUT ARGUMENTS

CDF	The cumulative distribution function value.

EXAMPLES

Sample program:

   program demo_chscdf
   use M_datapac, only : chscdf
   implicit none
   ! call chscdf(x,y)
   end program demo_chscdf

Results:

AUTHOR

The original DATAPAC library was written by James Filliben of the Statistical Engineering Division, National Institute of Standards and Technology.

MAINTAINER

John Urban, 2022.05.31

LICENSE

CC0-1.0

REFERENCES

o	National Bureau of Standards Applied Mathematics Series 55, 1964, page 941, Formulae 26.4.4 and 26.4.5.
o	Johnson and Kotz, Continuous Univariate Distributions--1, 1970, page 176, Formula 28, and page 180, Formula 33.1.
o	Owen, Handbook of Statistical Tables, 1962, pages 50-55.
o	Pearson and Hartley, Biometrika Tables for Statisticians, Volume 1, 1954, pages 122-131.

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Nemo Release 3.1

chscdf (3)

February 23, 2025

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