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The empirical literature on productivity effects of continuing training is constantly increasing. However, the results on this subject differ widely. Explanations for this worrying diversity seem to lie in differences between countries, labor market institutions, and data generation on one hand, and in differences between the underlying estimation techniques on the other ( Bartel, 2000 ). This paper concentrates on the latter problem and shows how results vary with different estimation techniques.
Thomas Zwick (Fri,) studied this question.
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