SPSS® 12.0 Command Syntax Reference

Example
Example
*Select cases.
INPUT PROGRAM.
DATA LIST FILE=PRICES /YEAR 1-4 QUARTER 6 PRICE 8-12(2).
DO IF (YEAR GE 1881). /*Stop reading before 1881
END FILE.
END IF.
END INPUT PROGRAM.
END FILE 517
LIST.
• This example assumes that data records are entered chronologically by year. The DO IF—
END IF structure specifies an end of file when the first case with a value of 1881 or later
for YEAR is reached.
• LIST executes the input program and lists cases in the working data file. The case that
causes the end of the file is not included in the working data file.
• As an alternative to an input program with END FILE, you can use N OF CASES to select
cases if you know the exact number of cases. Another alternative is to use SELECT IF to
select cases before 1881, but then the program would unnecessarily read the entire input
file.
Select cases but retain the case that causes end-of-file processing.
INPUT PROGRAM.
DATA LIST FILE=PRICES /YEAR 1-4 QUARTER 6 PRICE 8-12(2).
DO IF (YEAR GE 1881). /*Stop reading before 1881 (or at end of file)
END CASE. /*Create case 1881
END FILE.
ELSE.
END CASE. /*Create all other cases
END IF.
END INPUT PROGRAM.
LIST.
• The first END CASE command forces the program to retain the case that causes end-offile
processing.
• The second END CASE indicates the end of case for all other cases and passes them out of
the input program one at a time. It is required because the first END CASE command
causes the program to abandon default end-of-case processing (see END CASE).