SAS Base (53)

The following SAS program is submitted:

retain Total;
by Department;
if First.Department
then Total=0;
Total=sum(Total, Wagerate);
if Last.Total;

What is the initial value of the variable Total?

A. 0
B. Missing
C. The value of the first observations Wagerate
D. Cannot be determined from the information given

Check Answer
Answer: B

注解:The second line of codes, retain Total, initializes the variable Total.  As it doesn’t specify an initial value, a missing value is assigned to the variable. Please also check SAS Base (32) for the details of RETAIN statement.

One thought to “SAS Base (53)”

  1. The answer is (b).

    When no initial value is specified for the variable in the RETAIN statement, the variable is initiated with a missing value.

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