Documentation
ID Variables – case identifiers, how to merge files across survey years.
Special LINE Numbers – important LINE numbers.
Unit of Analysis – critical concept for analysis of multi-level data.
Variable Names – variable-naming system.
Missing Values – missing value indicators.
Date Variables – how date variables are handled.
Data Cleaning – general cleanup effort.
Notes / Data Problems – important data features and problems.
Using SAS XPORT Files – what they are and how to use them.