Understanding the Basics
When you use a SAS
data set as input into a DATA step, the description of the data set
is available to SAS. In your DATA step, use a SET, MERGE, MODIFY,
or UPDATE statement to read the SAS data set. Use SAS programming
statements to process the data and create an output SAS data set.
In a DATA step, you can create a new data set that is a subset of the original data set. For example, if you have a large data set of personnel data, you might want to look at a subset of observations that meet certain conditions, such as observations for employees hired after a certain date. Alternatively, you might want to see all observations but only a few variables, such as the number of years of education or years of service to the ...
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