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Comparison and logical operators
For more information,
see “SAS Operators in Expressions” in Chapter 6 of SAS Language Reference: Concepts and Acting on Selected Observations.
DROP= and KEEP= data set options
Using the DROP= and
KEEP= data set options to output a subset of variables to a SAS data
set are discussed in Starting with SAS Data Sets. For
more information, see “DROP= Data Set Option” in SAS Data Set Options: Reference and “KEEP= Data Set Option” in SAS Data Set Options: Reference.
FIRSTOBS= and OBS= data set options
Using these data set
options to select observations from the beginning, middle, or end
of a SAS data set are discussed in Starting with SAS Data Sets. For
more information, see “FIRSTOBS= Data Set ...
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