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Cumulative effects of teaching from fifth grade math and sixth grade reading scores in Dallas, TX.
(Beginning Percentile = 60)
After three years of very ineffective teachers, students beginning at the 60th percentile have dropped to the 27th percentile in Math and the 42nd percentile in Reading.
After three years of very effective teachers, students beginning at the 60th percentile have gone up to the 76th percentile in both Math and Reading.
Source: Jordan, Mendro & Weerasinghe, "Teacher Effects on Longitudinal Student Achievement" (1997)