The Excel file includes nominal and adjusted ADA scores for each member of Congress from 1947-2007. The file also includes annual nominal and adjusted chamber means and medians. Adjusted ADA scores were estimated by Sarah Anderson and Philip Habel using the method introduced by Groseclose, Levitt,and Snyder, "Comparing Interest Groups Scores across Time and Chambers: Adjusted ADA Scores for the U.S. Congress" American Political Science Review 93: 33-50.
Citation: Anderson, Sarah and Philip Habel. "Revisiting Adjusted ADA Scores for the U.S. Congress, 1947–2007"
Political Analysis Advance Access published on December 16, 2008. doi:10.1093/pan/mpn015