Probably you just want Y ~ .
where "." means everything which doesn't appear elsewhere in the formula. Michael On Thu, Nov 15, 2012 at 8:45 PM, farnoosh sheikhi <farnoosh...@yahoo.com> wrote: > > > Hi , > > I want to apply the following code fo my data with 400 predictors. > I was wondering if there ia an alternative way instead of typing 400 > predictors for the following code. > I really appreciate your help. > > fit0<-lm(Y~1, data= mydata) > fit.final<- lm(Y~X1+X2+X3+.....+X400, data=mydata) ??? > step(fit0, scope=list(lower=fit0, upper=fit.final), data=mydata, > direction="forward") > step(fit.final, scope=list(lower=fit.final, upper=fit0), data=mydata, > direction="backward") > > Best,Farnoosh Sheikhi > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
