R help - Oct 2011 - calling a variable which in turn calls many more variables

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 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]]

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