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...4:08 PM, Michal Figurski >> <figurski at mail.med.upenn.edu> wrote: >> >> Hi, >> >> I believe that you misunderstand the passage. Do you know what >> multiple stepwise regression is? >> >> Since they used SPSS, I copied from >> http://www.visualstatistics.net/SPSS%20workbook/stepwise_multiple_regression.htm >> >> >> "Stepwise selection is a combination of forward and backward procedures. >> Step 1 >> >> The first predictor variable is selected in the same way as in forward >> selection. If the probabil...

Hello all, I am trying to optimize my logistic regression model by using bootstrap. I was previously using SAS for this kind of tasks, but I am now switching to R. My data frame consists of 5 columns and has 109 rows. Each row is a single record composed of the following values: Subject_name, numeric1, numeric2, numeric3 and outcome (yes or no). All three numerics are used to predict