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 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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