Hi Wolfgang. I would be surprised if a doubly noncentral F-distribution function is available (and encourage you to check its accuracy if it is). Although R allows pf() to have a noncentral value specified, the results are not always accurate. I posted about this about a week ago (10/24/05) and didn't hear anything back regarding the accuracy issue. The bug I reported is here (# 8251): <http://viggo.kubism.ku.dk/cgi-bin/R/Accuracy?id=8251;user=guest>
I am very interested in (singularly) noncentral F-distribution functions, so I too would like to learn of a doubly noncentral F-distribution function (since the singularly noncentral F is a special case of the doubly noncentral F; or learn of an alternative or fix to pf() as it now stands). Have a good day, Ken Viechtbauer Wolfgang (STAT) wrote: > Hello All, > > Has anyone written a function for the distribution function of a > *doubly* non-central F-distribution? I looked through the archives, but > didn't find anything. Thanks! > > Wolfgang > > ______________________________________________ > 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 > -- Ken Kelley, Ph.D. Inquiry Methodology Program Indiana University 201 North Rose Avenue, Room 4004 Bloomington, Indiana 47405 http://www.indiana.edu/~kenkel ______________________________________________ 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