The MDAC Reference Manual is the key piece of information, or data dictionary, for MDAC analysis file variables. Contents of the manual include; variable definitions, discussion of pertinent issues related to the variables, variable level descriptions and cell frequencies. Electronic versions of this manual include hyperlinks to allow fluid navigation between a variable definition and the index listing of variables. Appendices in the manual include documentation for the MDAC local area characteristics files. Select one of the links below to download a PDF or Microsoft Word version of the Reference Manual.