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Set - 002 - Part 05
Question 1 of 30

Which one of the following is true of the RETAIN statement in a SAS DATA step program?

It can be used to assign an initial value to _N_ .

It is only valid in conjunction with a SUM function.

It has no effect on variables read with the SET, MERGE and UPDATE statements

It adds the value of an expression to an accumulator variable and ignores missing values.

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