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I have a data file consisting of 57 variables. I want to transform about 12 of them into z-scores due to their uneven level of measurement. I looked up internet resources and help files. One internet resource adviced that I need the package Rbasic (does not exist). I used scale() which only seemed to center the variables. I tried V5-mean/st.dev. which got me very strange scores. Can somebody please give me practical adivce?