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Defining and Modeling State-Dependent Dynamic Systems

Published online by Cambridge University Press:  04 January 2017

Justin Esarey*
Affiliation:
Department of Political Science, Rice University, 105 Herzstein Hall, 6100 Main Street, Houston, TX 77005
Jacqueline H. R. DeMeritt
Affiliation:
Department of Political Science, University of North Texas, 1155 Union Circle #305340, Denton, TX 76203
*
e-mail: justin@justinesarey.com (corresponding author)

Abstract

A state-dependent dynamic system is one in which (1) the marginal effect of x on y at time t () depends on the prior value of the dependent variable , and (2) the persistence of the dependent variable () depends on xt . We present a methodological strategy for dealing with state-dependent dynamic systems and demonstrate the consequences of ignoring state-dependence. As an applied example, we find evidence of state-dependence in the relationship between presidential approval and economic performance: high unemployment rates are most damaging to presidential approval among presidents with the highest initial approval ratings.

Information

Type
Research Article
Copyright
Copyright © The Author 2013. Published by Oxford University Press on behalf of the Society for Political Methodology 

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