I have a data set with the following 151 columns:    StudentID   Exam1 Exam2 Exam3 . . Exam50   Date1 Date2 Date3 . . Date50   Score1 Score2 Score3 . . . Score50   Question: How do I reorder this large set of variables as follows -    StudentID Exam1 Date1 Score1   Exam2 Date2 Score2   . . . Exam50 Date50 Score50?   I am at the level of a beginner. Is there a way I can reorder using RETAIN, but without manually entering the variables in the RETAIN statement?  ... View more