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Tips:SUM Statement and the Implied SUM Function
cnt + expression;
has the implied syntax of:
cnt = sum(cnt, expression);
Thus the following will count the observations, even though the summation variable, CNT, has been initialized to missing.
data new; set sashelp.class; if _n_=1 then cnt=.; cnt+1; run;
Submitted by Art Carpenter. Contact me at my Discussion Page.