brede_cdf_chi2 - CDF for chi2-distriibution
function P = brede_cdf_chi2(chi2, dof);
Input: chi2 chi2 values
dof Degrees of freedom
Output: P Lower tail cumulated probability
This function computes the lower tail cumulated probability
for the chi�-distribution. Evaluated via the incomplete gamma
function.
P = P(x<chi2,dof) = 1/(2^(dof/2) * gamma(dof/2)) *
integral from 0 to chi2 of x^(dof/2-1) * exp(-x/2) dx
See also BREDE, BREDE_CDF_BIN, BREDE_CDF_F, BREDE_CDF_GAUSS.
$Id: brede_cdf_chi2.m,v 1.2 2004/11/17 16:43:08 fnielsen Exp $