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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.