SAS Data Scientist Practice Questions - SAS Certified Professional Data Scientist Exam

What is the purpose of FIRST.byvar and LAST.byvar automatic variables in BY-group processing?

They store the first and last values of every variable They flag the first and last observation within each BY group, enabling group-level logic They sort the data by ascending and descending order They are file references for input and output datasets

Correct Answer:

They flag the first and last observation within each BY group, enabling group-level logic

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