Hi Klausch: > I was wondering if there are any R functions that give the tail area > of a sum of chisquare distributions of the type: > a_1 X_1 + a_2 X_2 > where a_1 and a_2 are constants and X_1 and X_2 are independent > chi-square variables with different degrees of freedom.
Christian Kleiber (Cc on this reply) has code for computing the distribution function of general linear combinations of chi-squared variables. It's not yet on CRAN, but just ask him for a devel-snapshot. Best wishes, Z ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
