Summary
Procedures
PROC SORT <DATA=SAS-data-set>
<OUT=SAS-data-set> <NODUPRECS>;
sorts a SAS data set
by the values of variables that are listed in the BY statement. If
you specify the OUT= option, the sorted data is stored in a different
SAS data set than the input data. The NODUPRECS option tells PROC
SORT to eliminate identical observations.
Statements
BY <DESCENDING> variable-1 <
. . . <DESCENDING> variable-n>;
in a DATA step, causes
SAS to create FIRST. and LAST. variables for each variable named in
the BY statement. The value of FIRST.variable-1 is
1 for the first observation with a given BY value, and 0 for other
observations. Similarly, the value of LAST.variable-1 is 1 for the last observation for a given BY value, and ...
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