RESEARCH REPORT SERIES (Statistics #2007-19) Analytically Valid Discrete Microdata Files and Re-identification William E. Winkler Statistical Research Division U.S. Census Bureau Washington, DC 20233 Report Issued: December 10, 2007 Disclaimer: This report is released to inform interested parties of research and to encourage discussion. The views expressed are those of the author and not necessarily those of the U.S. Census Bureau.