This creates the new file ENROLLED.SD2 in your diskette (a: drive). This is the new permanent SAS dataset. Only SAS will be able to interpret this file; you will not be able to see its contents by using a word processor or spreadsheet program. The two statements after data work like the following: "DATA name1 ; SET name2 ;" means to create a data set name1 from dataset name2 . The "IF ... THEN DELETE;" statement does the obvious operation. We will spend more time on them in Lesson 5. Thus, the data set college.enrolled has only three obeservations with class='day'. In order to use the dataset that was just created, you must refer to it with its full name, college.enrolled . To retrieve this data set from your diskette: