Macro Functions That Skip Blank and Use ??? Calls

Macro Function	How ??? Cells Are Used
COUNT	??? cells are counted.
COLUMN	??? cells are copied.
CV_FOLDS	Question marks (???) are treated as a separate class.
DELAY	??? cells are copied.
FREQ	Question marks (???) in a string column are counted as a separate class. In a numerical column, ??? is counted as a zero.
EXTRACT	Question marks (???) in the predicate_col are treated as zeros.
LAG	??? cells are copied.
MERGE	??? cells are copied.
SORT	All ??? cells are sorted at the end.
SAMPLE_RANDOM	??? cells can be sampled.
SELECT	??? cells are copied.
SUBSAMPLE	??? cells can be sampled.