Thanks Peter!
On 11/30/07, Peter Dalgaard <[EMAIL PROTECTED]> wrote:
>
> tom soyer wrote:
> > Hi,
> >
> > I am trying to find a function in R that would calculate the critical
> value
> > of t for a given probability and df. For example, if p=5% and df=20,
> then
> > does R have a function to calculate the t value? I tried:
> >
> >
> >> dt(0.05,df=20)
> >>
> > [1] 0.3934718
> >
> > That doesn't look right to me. Could someone tell me what I was missing?
> >
> > Thanks,
> >
> >
> qt()
>
> Notice that it gives only one tail (to the left by default), so you need
> p/2 for two-sided tests.
>
> --
> 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
> ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45)
> 35327907
>
>
>
--
Tom
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