Comparing Estimation Strategies for Income Equations in the Presence of Panel Attrition, Empirical Results Based on the ECHP
Since attrition in the European Community Household Panel (ECHP) has cumulated to a considerable extent, there is concern that attrition biases empirical analysis. In this paper we compare the performance of four different strategies for estimating an earnings equation in the presence of panel attrition. By splitting the completely observed sample in one wave according to the response behavior of the following wave, we assess empirically the bias of an un-weighted, an inverse probability weighted, a Heckman and a matching estimator through bootstrap methods. Our findings lead us to several conclusions. First, for the example of Mincerian earnings equations, attrition is no matter of great concern when using the ECHP data. Second, the three estimation strategies, which correct for attrition based on estimated response probabilites, reduce the number of signigicantly biased parameters. Third, the correction strategies strongly increase the variance of the estimates throuhg relying on estimated response probabilities and increase the relative bias. Hence, the reduction of significant biases is rather due to increased variance than due to lower biases. This result is confirmed when comparing the mean square error of the different estimation techniques. Therefore, for the estimation of inocme equations the uncorrected estimation based on respondents is suggested as the superior estimation strategy.
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Volume (Year): 226 (2006)
Issue (Month): 4 (July)
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