SPSS® 12.0 Command Syntax Reference

Example
DO IF 497
DO IF (YRHIRED GT 87).
COMPUTE BONUS = 0.
ELSE.
IF (DEPT87 EQ 1) BONUS = .12*SALARY87.
IF (DEPT87 EQ 2) BONUS = .14*SALARY87.
IF (DEPT87 EQ 3) BONUS = .1*SALARY87.
IF (DEPT87 EQ 4) BONUS = .08*SALARY87.
END IF.
• If an individual was hired after 1987 (YRHIRED is greater than 87), BONUS is set to 0 and
control passes out of the structure. Otherwise, control passes to the IF commands
following ELSE.
• Each IF command evaluates every case. The value of BONUS is transformed only when
the case meets the criteria specified on IF. Compare this structure with ELSE IF in the
second example on p. 498, which performs the same task more efficiently.
Example
* Test for listwise deletion of missing values.
DATA LIST / V1 TO V6 1-6.
BEGIN DATA
123456
56
1 3456
123456
123456
END DATA.
DO IF NMISS(V1 TO V6)=0.
+ COMPUTE SELECT=’V’.
ELSE
+ COMPUTE SELECT=’M’.
END IF.
FREQUENCIES VAR=SELECT.
• If there are no missing values for any of the variables V1 to V6, COMPUTE sets the value
of SELECT equal to V (for valid). Otherwise, COMPUTE sets the value of SELECT equal
to M (for missing).
• FREQUENCIES generates a frequency table for SELECT. The table gives a count of how
many cases have missing values for one or more variables, and how many cases have
valid values for all variables. Commands in this example can be used to determine how
many cases are dropped from an analysis that uses listwise deletion of missing values.
See pp. 257 and 740 for alternative ways to check listwise deletion of missing values.
ELSE IF Command
ELSE IF executes one or more transformations when the logical expression on DO IF is not
true.
• Multiple ELSE IF commands are allowed within the DO IF—END IF structure.