April 2013
Beginner to intermediate
275 pages
6h 27m
English
Content preview from Handbook of SAS DATA Step Programming
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50 Handbook of SAS
®
DATA Step Programming
FIGURE 4.4
Third iteration for Program 4.1.
51BY-Group Processing in the DATA Step
4.2 Applications Utilizing BY-Group Processing
Longitudinal data does not always require BY-group processing when it is
read into a SAS data set. Instead, a program that uses BY-group processing
does so to identify either the beginning or the end of a measurement within a
BY group. Therefore, a DATA step that uses BY-group processing frequently
contains the following:
1. A cumulating variable is initialized to 0 when the FIRST ...
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