[R] calling a variable which in turn calls many more variables

[Ista Zahn]

Hi Justin,

On Wed, Oct 5, 2011 at 3:32 PM, justin jarvis
<littledude.jarvis at gmail.com> wrote:
> Hi all,
> I am running regressions with many covariates, most of which remain the same
> each time (control variables).  Instead of writing 30 demographic variables
> every regression, is there a way I could call them all at once using a
> variable called, perhaps "demog"?

I would create a base model with just the covariates, and then use
update() to add other variables.

Best,
Ista

>
> I have tried:
>> demog <- list(age1, age2, age3) but I get an error when I try to call a
> list in a regression.
>
> I also tried:
>> demog <- cbind(age1, age2, age3) which allows me to run a regression, but
> this is not practical because when I subset the original data set and run a
> regression, this new matrix demog doesn't get subsetted as well, so the
> variables are of differing length.
>
> I'm thinking there is an easy way to do this.  Thanks for any help
> guys/gals.
>
> Justin
> PhD student,
> University of California, Irvine
>
>        [[alternative HTML version deleted]]
>
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-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org