SAS Tutorial Basics 4 - DATA STEP - Using DROP, KEEP, and SORT to modify variables in data sets. From SAS ESSENTIALS by Elliott and Woodward, 2nd Edition., For more info see www.stattutorials.com. This tutorial provides step-by-step examples of how to use DROP, KEEP, and SORT to rearrange your data set, and to modify what variables to retain.

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