View Research by Author - Eric A. Hanushek

Publications

Most analyses of teacher quality end without any assessment of the economic value of altered teacher quality. This paper begins with an overview of what is known about the relationship between teacher quality and student achievement. Alternative valuation methods are based on the impact of increased achievement on individual earnings and on the impact of low teacher effectiveness on economic growth through aggregate achievement. A teacher one standard deviation above the mean effectiveness annually generates marginal gains of over $400,000 in present value of student future earnings with a class size of 20 and proportionately higher with larger class sizes. Replacing the bottom 5-8 percent of teachers with average teachers could move the U.S. near the top of international math and science rankings with a present value of $100 trillion.

This paper presents preliminary estimates of key elements of the market for school principals, employing rich panel data on principals from Texas State. The consideration of teacher movements across schools suggests that principals follow patterns quite similar to those of teachers - preferring schools that have less demands as indicated by higher income students, higher achieving students, and fewer minority students. Looking at the impact of principals on student achievement, there are some small but significant effects of the tenure of a principal in a school. Moreover, the variation in principal effectiveness tends to be largest in high-poverty schools, consistent with hypothesis that principal ability is most important in schools serving the most disadvantaged students. Principals who stay in a school tend to be more effective than those who move to other schools.

Search theory suggests early career job changes lead to better matches that benefit both workers and firms, but this may not hold true in teacher labor markets characterized by salary rigidities, barriers to entry, and substantial differences in working conditions. Education policy makers are particularly concerned that teacher turnover may have adverse effects on the quality of instruction in schools serving predominantly disadvantaged children. Although these schools experience higher turnover, on average, than other schools, the impact on the quality of instruction depends on whether more productive teachers are more likely to depart. In Texas, the availability of matched panel data of students and teachers enables the isolation of teachers' contributions to achievement. Teachers who remain in their school tend to outperform those who leave, particularly those who exit Texas public schools entirely. This gap is larger for schools serving mainly low income students— evidence that high turnover is not nearly as damaging as many suggest.

Can value-added measures provide valuable information to assess the quality of teachers and to create incentives for improvement? CALDER researchers tackle this important and timely question by describing the analytic framework of value-added measures, by identifying methodological concerns about value-added estimation and ways to mitigate them, and by discussing the policy uses of value-added estimates of teacher effectiveness.

This research brief examines differences in teacher effectiveness by school transition status and school characteristics in a large urban school district in Texas, using estimates of teacher effectiveness based on teacher contributions to student learning outcomes across classrooms. This research finds little or no evidence to support the view that more effective teachers have higher exit probabilities. In fact, the study finds that teachers who exit are significantly less effective, on average, than those who stay.

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