Which one of the following is true of the SUM statement in a SAS DATA step program?
A. It is only valid in conjunction with a SUM function.
B. It is not valid with the SET, MERGE and UPDATE statements.
C. It adds the value of an expression to an accumulator variable and ignores missing values.
D. It does not retain the accumulator variable value from one iteration of the SAS DATA step to the next.
2 comments:
c
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