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Published online by Cambridge University Press: 12 February 2008
We measure legislative productivity for the entire history of the U.S. Congress. Current measures of legislative productivity are problematic because they measure productivity for a limited number of decades and because they are based on different aspects of productivity. We provide a methodology for measuring (1) a Legislative Productivity Index (LPI) and (2) a Major Legislation Index (MLI). We use the W-CALC algorithm of Stimson (1999, Public opinion in America: Moods, cycles, and swings. 2nd ed. Boulder, CO: Westview Press) to combine information from previously used indicators of productivity into measures of the LPI and the MLI. We provide examinations of content, convergent, and construct validity. The construct validity model includes potential determinants of legislative productivity. We conclude that the LPI and the MLI are superior measures of productivity than other measures used in the literature.
Author's note: A previous version of this article was presented at the 2006 meeting of the Midwest Political Science Association. For suggestions and criticisms, we thank James Avery, Jason Barabas, Janet Box-Steffensmeier, Sean Ehrlich, Chuck Finocchiaro, Jason Gainous, Mark Hurwitz, Jennifer Jerit, Gregg Johnson, Jana Morgan, Scott McClurg, and four anonymous reviewers.