The remainder of this documentation proceeds in three parts. We begin with an overview of the project and the data, including some of the purposes to which the data might be put, th conceptual organization of the data, and the units of analysis and variables provided. All users should read this part.
The overview is followed by a User's Guide to the ROAD datasets. Scholars who plan to use our data for substantive research should also read this section, as all variables, states, units of analysis, etc., are fully documented here. (You can, of course, draw real maps with ROAD data.)
The final part includes all technical details of the process we used to generate the ROAD files. This part need only be consulted by those who wish to extend or improve our data.
The Glossary defines terms used throughout this document.
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