Re: [Rd] solve cdf for noncentrality (PR#11527)

From: <>
Date: Tue, 14 Oct 2008 15:45:10 +0200 (CEST)

R implementations of Student's t, chi-squared, F, and beta distributions all support noncentrality parameters. There is often a need (for example in sample size problems) to invert the cdf to obtain the noncentrality parameter given the quantile, instead of to obtain the quantile given the noncentrality (as the q... functions do). For example, in SAS, these functions are called TNONCT, CNONCT, and FNONCT.

I believe that 2.7.0 was the current version when I submitted this on 27 May, 2008. If it has been subsequently addressed, I can find no mention of it either in the 2.7.2 Reference Manual or in today's


Uwe Ligges <> wrote
> wrote:
> > Full_Name: Jerry W. Lewis
> > Version: 2.7.0
> > OS: Windows XP Professional
> > Submission from: (NULL) (
> >
> >
> > If you are saying that there is no need to solve for the noncentrality
> > parameter, please justify this amazing assertion.
> - He? What noncentrality are you talking about?
> - You are reporting a bug with an outdated version of R.
> - You have not followed the guide on how to report bugs in R.
> Uwe Ligges
> > If you are saying that this need is already adequately addressed in R,
> > please enlighten me.

        [[alternative HTML version deleted]] mailing list Received on Tue 14 Oct 2008 - 15:35:59 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Tue 14 Oct 2008 - 16:30:19 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.

list of date sections of archive