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Randomization Tests and Multi-Level Data in U.S. State Politics

Published online by Cambridge University Press:  25 January 2021

Robert S. Erikson ,
Pablo M. Pinto  and
Kelly T. Rader
Robert S. Erikson
Affiliation:
Columbia University
Pablo M. Pinto
Affiliation:
Columbia University
Kelly T. Rader
Affiliation:
Columbia University
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Abstract

Many hypotheses in U.S. state politics research are multi-level, positing that state-level variables affect individual-level behavior. Unadjusted standard errors for state-level variables are too small, leading to overconfidence and possible false rejection of null hypotheses. Primo, Jacobsmeier, and Milyo (2007) explore this problem in their reanalysis of Wolfinger, Highton, and Mullin's (2005) data on the effects of post-registration laws on voter turnout. Primo et al. advocate the use of clustered standard errors to solve the overconfidence problem, but we offer an alternative solution: randomization tests. Randomization tests are non-parametric tests that do not rely on comparisons to theoretical test statistic distributions. Instead, they use distributions tailored to the data, created by randomly scrambling the data many times to simulate what would be observed under the null hypothesis. Unlike with clustering, with the randomization test, U.S. state-level reforms generally fail to be significant both as additive effects and as interactions with individual characteristics.

Type
Research Article
Information
State Politics & Policy Quarterly , Volume 10 , Issue 2 , Summer 2010 , pp. 180 - 198
Copyright
Copyright © 2010 by the Board of Trustees of the University of Illinois

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