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    How to group variables for regression analysis?

    Hi all, Here's my problem: I have 6 variables: Sex (1,2), Age (18, 18, 19, 21, 25, 25, etc), and four variables describing physical parameters; W, X, Y are continuous (1.2323, .0423, etc), and Z is a mean with a standard deviation. FYI, these are bone measurements. These four variables...