[R] ncp in dt

[Peter Dalgaard]

Mark.Leeds at morganstanley.com writes:

> i meant dt function in my email below. my aopolgies. On Wed, 1 Nov 2006
> Mark.Leeds at morganstanley.com wrote:
> 
> >
> > i just wanted to know if the "non centraility parameter" as it is referred
> > to in the dt test is
> > what i would think of as mu zero if i was doing a test of a
> > hypothesis that the mean was equal to mu zero and the variance was
> > unknown. thanks.

The other way around: If testing that mu is zero, when it is really
mu_zero and the sd is one.

(The noncentral t is roughly centered around the ncp.)



-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907