Often, variables in their original form do not lend themselves well to comparison with other variables or to certain types of analysis. In addition, often we may obtain greater insight by expressing a variable in a different form. For these and other reasons, in this chapter we discuss four different ways to re-express or transform variables: applying linear transformations, applying nonlinear transformations, recoding, and combining. We also describe how to use syntax files to manage your data analysis.
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