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Automatic variable _N_
provides a way to count
the number of times SAS executes a DATA step. For more information,
see Writing Lines to the SAS Log or to an Output File.
SAS creates _N_ in
each DATA step. The first time SAS begins to execute the DATA step,
the value of _N_ is 1. The second time SAS begins to execute, the
value is 2, and so on. SAS does not add _N_ to the output data set.
Using _N_ is more efficient than using a Sum statement.
DO groups
specifies a group of
statements that are executed as a unit. For information about
DO group processing, see Finding Shortcuts in Programming. For more information
about the DO statement, see “DO Statement” in SAS Statements: Reference.
END= option
can be used in a SET statement. ...
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