pchisq3m

Overview

function pchisq.f

source
Bevington, pages 192-193.

purpose
evaluate probability for exceeding chi square

usage
result = pchisq (chisqr, nfree)

description of parameters
chisqr - comparison value of reduced chi square
nfree - number of degrees of freedom

subroutines and function subprograms required
gamma (x)
calculates gamma function for integers and 1/2-integers

comments
calculation is approximate for nfree odd and
chi square greater than 50