Does Teacher Certification Matter? High School Teacher Certification Status and Student Achievement - 2003

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Evaluating the Evidence on Teacher Certification: A Rejoinder - 2003

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Testing for Sample Selection in the Milwaukee School Choice Experiment - 2003

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Why don't schools and teachers seem to matter? : assessing the impact of unobservables on educational productivity - 1997

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Do teachers' race, gender, and ethnicity matter? : evidence from the National Educational Longitudinal Study of 1988 - 1995

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