Download This PaperMeasuring Bias and Uncertainty in DW-NOMINATE Ideal Point Estimates via the Parametric Bootstrap
25 Pages Posted: 14 Oct 2008
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Measuring Bias and Uncertainty in DW-NOMINATE Ideal Point Estimates via the Parametric Bootstrap
Measuring Bias and Uncertainty in DW-NOMINATE Ideal Point Estimates via the Parametric Bootstrap
Date Written: September 4, 2008
Abstract
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 one to four percent of the range of DW-NOMINATE coordinates.
Keywords: Congress, nominate, ideal points
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