Step-wise method for large dimension
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_81 at 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
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