[R] offset

[E.A.Catchpole]

Jim,

Aha! offset(off) works. "offset=off" doesn't, as far as I can see.

But yes, I'll do my best to get R installed here before I leave.

That's terrific. Many thanks.

Ted.

---------------
Dr E.A. (Ted) Catchpole			
School of Maths & Stats			Honorary Senior Research Fellow
University College, UNSW		Institute of Maths & Stats      
Australian Defence Force Academy	University of Kent at Canterbury
e-catchpole at adfa.edu.au			Canterbury, CT2 7NF, England
http://www.ma.adfa.edu.au/~eac		E.A.Catchpole at ukc.ac.uk

On Wed, 29 Nov 2000, Jim Lindsey wrote:

> > 
> > Jim,
> > 
> > Thanks for the instant reply. Which dpcs? I've got the Splus ver5 manual
> > "Guide to Statistics" on my desk, and there's no mention of "offset" in
> > glm. Nor in the online
> > help, as far as I can see. And I looked thorough CRAN last night and
> > couldn't find a glm . . . Sorry to be dense . . 
> 
> Sorry. I didn't have my machine running when I first answered.
> 
> I checked. In R, the help is clear when I type ?offset. Just add
> offset(off) to your linear model where off is the offset vector. The
> second possibility, as I mentioned, is to use the offset option in the
> glm function: glm(...,family=binomial,offset=off).
> 
> You right about S-Plus2000. My son looked and cannot find
> offset. ?offset says it is internal, used by formula, but how????
> Apparently, the first method above does work.
> 
> Your best bet is to download and install R, 15 minutes work on most
> machines.
>   Good luck. Jim
> 
> > 
> > Ted.
> > ---------------
> > Dr E.A. (Ted) Catchpole			
> > School of Maths & Stats			Honorary Senior Research Fellow
> > University College, UNSW		Institute of Maths & Stats      
> > Australian Defence Force Academy	University of Kent at Canterbury
> > e-catchpole at adfa.edu.au			Canterbury, CT2 7NF, England
> > http://www.ma.adfa.edu.au/~eac		E.A.Catchpole at ukc.ac.uk
> > 
> > On Wed, 29 Nov 2000, Jim Lindsey wrote:
> > 
> > > > 
> > > > I would like to do a logistic multiple regression on a binary variate,
> > > > with what Genstat calls an offset, ie a regression variable with the
> > > > coefficient constrained=1. I'm far from home and have Splus but not R
> > > > here, but any information from either source would be very welcome. I'd
> > > > hate to have to go back to using Genstat . . .
> > > 
> > > offset can be used (in two different, but equivalen ways) in glm in R
> > > or S-Plus. See the docs. Jim
> > > 
> > > > 
> > > > Thanks,
> > > > 	Ted.
> > > > ---------------
> > > > Dr E.A. (Ted) Catchpole			
> > > > School of Maths & Stats	
> > > > University College, UNSW		Institute of Maths & Stats      
> > > > Australian Defence Force Academy	University of Kent at Canterbury
> > > > e-catchpole at adfa.edu.au			Canterbury, CT2 7NF, England
> > > > http://www.ma.adfa.edu.au/~eac		E.A.Catchpole at ukc.ac.uk
> > > > 
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> 

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