minimize memory usage of MEANS procedure

[richard_hu2003]

When attempting to minimize memory usage, the
most efficient way to do group processing when
using the MEANS procedure is to use:
A.
the BY statement.
B.
GROUPBY with the NOTSORTED specification.
C.
the CLASS statement.
D.
multiple WHERE statements.

Which is the best answer? A or C? Thanks.

[Ksharp]

I choose A. Is it right?


Ksharp

[SASKiwi]

Agreed. For large numbers of levels MEANS/SUMMARY using BY also runs a lot faster than using CLASS, at the expense of having to sort first.