[R] Power set

[Frank E Harrell Jr]

Laura Holt wrote:
> Hi again!
> 
> I have a data.frame with the columns y, x1, x2, x3.
> 
> I would like to fit linear models with one variable at a time,
> then 2 variables at a time, and then 3.
> 
> Makes me think of a power set.

Makes me think of irreproducible results if you use the output to select 
a single model  :-)

Frank Harrell

> 
> Anyhow, is there a function to produce the right hand side of the 
> formulas, please?
> 
> thanks,
> Laura Holt
> mailto: lauraholt_983 at hotmail.com
> R Version 2.1.0 Windows

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University