Hi R-list members,
Could somebody explain to me the meaning of the '.' in the formula
SumTL~. below? I could not find it in the help pages. I'm guessing it is
substituted by v1+v2+v3+.. for all independent variables vi.
Furthermore, I would like to add interaction effects to the model,
is this also possible with the '.'?
> library(leaps)
> d<-regsubsets(SumTL~.,nbest=2,data=dat[,-c(2,9)])
> x11() ; par(mfrow=c(1,4)) ; plot(d) ; plot(d,scale="Cp") ;
plot(d,scale="adjr2") ; plot(d,scale="r2")
My data 'dat' variable looks like this:
> str(dat)
'data.frame': 548 obs. of 9 variables:
$ SumTL: int 13500 67800 158000 299000 486000 712000 56100 162000
310000 471000 ...
$ SumUL: int 13800 69700 163000 308000 497000 726000 58100 168000
319000 481000 ...
$ Ord : int 96 192 288 384 480 576 192 288 384 480 ...
$ Incid: int 0 0 0 0 0 0 0 0 0 0 ...
$ f1 : int 1 1 1 1 1 1 1 1 1 1 ...
$ f2 : int 0 0 0 0 0 0 0 0 0 0 ...
$ f3 : int 0 0 0 0 0 0 0 0 0 0 ...
$ f4 : int 0 0 0 0 0 0 0 0 0 0 ...
$ f5 : int 0 0 0 0 0 0 0 0 0 0 ...
Thanks,
Jonne.
