Journal
ECONOMICS LETTERS
Volume 120, Issue 2, Pages 346-349Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.econlet.2013.05.009
Keywords
Dynamic model; Initial conditions; Panel data; Unbalanced panels
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Wooldridge (2005) provided a simple and elegant solution to the initial conditions problem for dynamic nonlinear unobserved-effects models. His original auxiliary model includes the time-varying explanatory variables at each period. Unfortunately, a popular constrained version that includes within-means of the explanatory variables can be severely biased. We show that there are several ways to avoid this problem. (C) 2013 Elsevier B.V. All rights reserved.
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