From ligges at statistik.tu-dortmund.de  Tue Oct 14 15:50:07 2008
From: ligges at statistik.tu-dortmund.de (ligges at statistik.tu-dortmund.de)
Date: Tue, 14 Oct 2008 15:50:07 +0200 (CEST)
Subject: [Rd] solve cdf for noncentrality (PR#11527)
Message-ID: <20081014135007.9316F282C768@mail.pubhealth.ku.dk>



Jerry Lewis wrote:
> 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

Thanks for the clarification. I was not aware you were citing an old bug 
report, because you had not cited anything in your message except for 
the old PR#.

Uwe Ligges




> 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 - You are reporting a bug with an outdated version of R.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.



[Rd] solve cdf for noncentrality (PR#11527)
ligges at statistik.tu-dortmund.de