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

[jerry.lewis at biogenidec.com]

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 
https://svn.r-project.org/R/trunk/NEWS

Jerry

Uwe Ligges <ligges at statistik.tu-dortmund.de> wrote
>
> Jerry.Lewis at biogenidec.com wrote:
> > Full_Name: Jerry W. Lewis
> > Version: 2.7.0
> > OS: Windows XP Professional
> > Submission from: (NULL) (198.180.131.16)
> >
> >
> > 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 - You are reporting a bug with an outdated version of R.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, 
then
> > please enlighten me.
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