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. 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
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