[R] looping through predictors

[David Winsemius]

I already answered a very similar question earlier today. It was in  
the context of a question about a different regression function, but  
the formula methods are generic. Look for "Question on passing in  
parameter to Cox hazard".

(That does not mean I approve of such fishing expeditions.)

-- 
David.

On Mar 9, 2010, at 6:26 PM, Dimitri Liakhovitski wrote:

> Dear R-ers,
> I have a data frame data with predictors x1 through x5 and the
> response variable y.
> I am running a simple regression:
>
> reg<-lm(y~x1, data=data)
>
> I would like to loop through all predictors. Something like:
> predictors<-c("x1","x2",... "x10)
> for(i in predictors){
>  reg<-lm(y~i)
> etc.
> }
>
> But it's not working. I am getting an error:
> Error in model.frame.default(formula = Y ~ x1 + x2 + x3 + i, data =  
> sample,  :
>  variable lengths differ (found for 'i')
>
> How can I make it take predictor names in the lm formula?
> Thank you!
>
> -- 
> Dimitri Liakhovitski
> Ninah.com
> Dimitri.Liakhovitski at ninah.com
>


David Winsemius, MD
West Hartford, CT