A good teacher not only improves a child’s test scores in the classroom, but also enhances his or her chances to attend college, earn more money and avoid teen pregnancy, according to a new seminal study.
The study, conducted by economists Raj Chetty and John N. Friedman of Harvard and Jonah E. Rockoff of Columbia, tracked 2.5 million students over 20 years from a large urban school district from fouth grade to adulthood, making it one of the largest and most consequential educational studies in recent years.
Their findings focus on the long-term impact of teachers based on their “value-added” ratings. This refers to the average test-score improvement for a teacher’s students, adjusted for differences across schools and classrooms such as prior test scores. Evaluating teachers based on student performance has been the subject of much debate among teachers, unions and policymakers.
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