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Political Analysis Advance Access published online on June 25, 2009
Political Analysis, doi:10.1093/pan/mpp005
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© The Author 2009. Published by Oxford University Press on behalf of the Society for Political Methodology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Measuring Bias and Uncertainty in DW-NOMINATE Ideal Point Estimates via the Parametric Bootstrap

Royce Carroll

Department of Political Science, MS 24, Rice University, PO Box 1892, Houston, TX 77251-1892

Jeffrey B. Lewis and James Lo

Department of Political Science, University of California—Los Angeles, Bunche Hall Los Angeles, CA 90095 e-mail: jameslo{at}ucla.edu (corresponding author)

Keith T. Poole

Department of Political Science, Social Sciences Building, Room 301, 9500 Gilman Drive, MC 0521, University of California—San Diego, La Jolla, CA 92093-0521

Howard Rosenthal

Department of Politics, Corwin Hall, Princeton University, Princeton, NJ 08540

DW-NOMINATE scores for the U.S. Congress are widely used measures of legislators’ ideological locations over time. These scores have been used in a large number of studies in political science and closely related fields. In this paper, we extend the work of Lewis and Poole (2004) on the parametric bootstrap to DW-NOMINATE and obtain standard errors for the legislator ideal points. These standard errors are in the range of 1%–4% of the range of DW-NOMINATE coordinates.

Authors’ note: We thank the National Science Foundation, Rice University, and the San Diego Supercomputer Center for their support. Replication materials are available on the Political Analysis Web site.


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