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Teachers and student achievement in the Chicago public high schools
We match administrative data on Chicago public high school students and teachers at the classroom level to estimate the importance of teachers to mathematics test score gains. We show that sampling variation and other measurement issues are important drivers of nave estimates of teacher effects, in some cases accounting for the majority of dispersion in teacher quality. However, correcting for these problems, teachers are still economically and statistically influential. Replacing a teacher with another that is rated two standard deviations superior in quality can add 0.35 to 0.45 grade ...