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.