Measuring the Impacts of Teachers I: Evaluating Bias in Teacher Value-Added Estimates
AbstractAre teachers' impacts on students' test scores ("value-added") a good measure of their quality? One reason this question has sparked debate is disagreement about whether value-added (VA) measures provide unbiased estimates of teachers' causal impacts on student achievement. We test for bias in VA using previously unobserved parent characteristics and a quasi-experimental design based on changes in teaching staff. Using school district and tax records for more than one million children, we find that VA models which control for a student's prior test scores exhibit little bias in forecasting teachers' impacts on student achievement. Although teachers have substantial impacts, differences in teacher quality account for a small fraction of achievement gaps across demographic groups, as more than 85% of the variation in teacher VA is within rather than between schools.
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Bibliographic InfoPaper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 19423.
Date of creation: Sep 2013
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- H0 - Public Economics - - General
- H52 - Public Economics - - National Government Expenditures and Related Policies - - - Government Expenditures and Education
- H75 - Public Economics - - State and Local Government; Intergovernmental Relations - - - State and Local Government: Health, Education, and Welfare
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- NEP-EDU-2013-09-26 (Education)
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