[R] lm question
wsi at gcal.ac.uk
Mon Oct 9 13:53:13 CEST 2000
Thanks very much Peter, Martyn, and Brian for the help.
> > lm(y~x:(grp-1)+1)
> lm(formula = y ~ x:(grp - 1) + 1)
> (Intercept) x.grpa x.grpb x.grpc
> -0.80977 0.01847 0.13124 0.14259
It seems to me that there is something seriously wrong here since for the
data I posted (I just re-checked it),
intercept=-1, slope a=.1, slope b=.2, and slope c = .3
(These fit the data exactly)
This leaves aside the comments of Martyn and Brian.
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