Have a look at "nam[com[1,1]]" , You're regressing
against a character. Try
mod<-lm(y~dat[, com[1,1]],data=dat)
--- Daniel O'Shea <[EMAIL PROTECTED]> wrote:
> I am trying to refer to a variable name in a lm
> regression where the variable name is in another
> variable, but it does seem to work. Here is an
> example:
>
> y<-rnorm(10)
>
dat<-data.frame(x1=rnorm(10),x2=rnorm(10),x3=rnorm(10))
> nam<-c('x1','x2','x3')
> library(gtools)
> com<-combinations(3,2,1:3)
> mod<-lm(y~nam[com[1,1]],data=dat)
>
> #error in model frame....:variable lengths differ().
>
> I also get the error if i just refer to variable x1
> as nam[1] in the lm. any suggestions. I am trying
> to set up a for loop that will perform an all
> subsets regression and calculate the AIC for each.
>
> Dan
>
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>
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