July 2018
Beginner
536 pages
12h 32m
English
Chapter 24: Working with Multiple Observations per Subject
24.2 Identifying the First or Last Observation in a Group
24.3 Counting the Number of Visits Using PROC FREQ
24.4 Computing Differences between Observations
24.7 Using a Retained Variable to “Remember” a Previous Value
You might encounter data sets with multiple observations per subject (or other groupings such as transactions on a single day or observations grouped in other ways). These data structures are sometimes ...