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Revisiting Adjusted ADA Scores for the U.S. Congress, 1947–2007

  • Sarah Anderson (a1) and Philip Habel (a2)


This paper replicates and extends Groseclose, Levitt, and Snyder, “Comparing Interest Group Scores Across Time and Chambers: Adjusted ADA Scores for the U.S. Congress,” which appeared in the American Political Science Review (1999/93:33–50). We replicate the most recent unpublished extension by Dr. Groseclose and research assistants for years 1947–1999, and then we extend the analysis to include years 2000 through 2007. We make available inflation-adjusted ADA scores from 1947 through 2007, allowing scholars to incorporate the most recent interest group scores into their analyses.


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Author's Note: Authors are listed alphabetically. The authors wish to thank Tim Groseclose for making available both the nominal ADA scores from 1947 to 1999 and the Matlab program files used in this analysis. SA gratefully acknowledges the support of the Hoover Institution during her time there as the 2006–07 W. Glenn Campbell and Rita Ricardo-Campbell National Fellow and the Robert Eckles Swain National Fellow. PH wishes to thank both the Dirksen Congressional Center and the National Science Foundation, doctoral dissertation improvement division grant 493469, for their generous support. He also wishes to acknowledge the valuable research assistance of James Lewis, Joshua Mitchell, and Matt Bergbower. Special thanks to J. Tobin Grant, Scott McClurg, and Wendy Tam Cho for their helpful feedback and assistance. All errors are the responsibility of the authors. Replication materials and programs are available on the Political Analysis Web site.



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Revisiting Adjusted ADA Scores for the U.S. Congress, 1947–2007

  • Sarah Anderson (a1) and Philip Habel (a2)


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