Message-ID: <x2hei9vbhd.fsf@biostat.ku.dk>
Date: 2002-08-05T10:36:14Z
From: Peter Dalgaard
Subject: How to get p-values
In-Reply-To: <200208051221.41646.mditzen@zedat.fu-berlin.de>
Mathias Ditzen <mditzen at zedat.fu-berlin.de> writes:
> Hello all there,
> I want to reimplement (for my personal, still very limited understanding of
> statistics) the linear regression. Now how do I get the correct values for F
> and T distributions (something like F.05[1,2], where 1 and 2 are degrees of
> freedom)? I tried dt and df, but the values I got were not correct.
> Thank you very much in advance,
> Mathias Ditzen
Functions to give p values all start with p: pf and pt. Be careful to
note that they give the lower tail of the respective distributions. To
get an upper tail, subtract from 1 (or use lower.tail=FALSE). To get
two-tailed tests add both tails together (which is often the same as
multiplying by two).
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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