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Lines 3–7.
| Line | Code |
|---|---|
| 3. | DATA cases controls; |
| 4. | SET population; |
| 5. | IF casecontrol = 1 THEN OUTPUT cases; |
| 6. | ELSE OUTPUT controls; |
| 7. | RUN; |
Population is a data set containing both cases and possible controls. This data set should have a variable called “casecontrol” and a variable called “uniqueid.” The data set should also include the matching variables. The data step creates two new data sets, cases and controls.
