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

From: <ligges_at_statistik.tu-dortmund.de>
Date: Tue, 14 Oct 2008 15:50:07 +0200 (CEST)

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 - You are reporting a bug with an outdated version of R.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

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