[R] qt with ncp?
peter.malewski at gmx.de
Mon May 7 18:53:12 CEST 2001
On Mon, May 07, 2001 at 06:45:32PM +0200, Peter Dalgaard BSA wrote:
> Peter Malewski <peter.malewski at gmx.de> writes:
> > Does anybody has a function or idea how to calculate qt with a noncentrality
> > parameter? I'm porting a SAS-macro for equivalence (Wellek, 1994 TT2ST) to R
> > and it seems that I need this to calculate tinv (SAS-command, I hope that
> > this is R's qt,...I get the SAS-macro manual next week).
> The easiest way is probably to use something like
> uniroot(function(x)pt(x, df, ncp) - p, c(-1e7,1e7))
> It's not going to be fast, but if you just need one of them...
> (Look inside power.t.test for variations on the theme)
Thanks for that hint. I'll see.
P.Malewski, Limmerstr.47, 30451 Hannover, 0511-2135008
At work: http://www.MH-Hannover.de 0511 532 3194 / Fax: 0511 532 3190,
P.Malewski at tu-bs.de, peter.malewski at gmx.de, malewski.peter at mh-hannover.de.
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