R help - Apr 2013 - Model Selection based on individual t-values with the largest possible number of variables in regression

To say that these strategies represent bad statistical practice is to put it
mildly.
Frank

mister_O wrote
> Dear R-Community,
> 
> When writing my master thesis, I faced with difficult issue. Analyzing the
> capital structure determinants I have one dependent variable (Total debt
> ratio = TD) and 15 independent ones. At the first stage  I normalized my
> data by deleting outliers from each variable (Pairwise deletion) and in
> the result I got every variable to be  with different length. Now when
> selecting relevant variables for the "best" model, neither
stepwise nor
> forward or backward procedures don't work perfectly since there are a
> number of other combinations of variables wich have also high t-values.
> Thus, wichever model I pick, you never know whether this model is
> trustworthy. I tried to calculate all possible combinations of independent
> variables, but since I have 15 ones, there are thousands of such
> combinations and R simply refuses to calculate them! (computer crashes) I
> wonder if you can help me to write the code in R in order to find the
> model wich include as many variables as it possible with significant
> t-values? 
> 
> cheers, Oleg




-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
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