New York City Reportedly Released Disputed Value-Added Teacher Ratings for Thousands of Teachers

After a legal dispute over public-records requests, the New York City Department of Education released Teacher Data Reports that used a value-added statistical model to rate thousands of public-school teachers based on estimated student test-score growth. News outlets published the ratings in February 2012, and teachers, unions, and analysts disputed the scores as imprecise and potentially misleading, citing large error margins, limited samples, and apparent roster-linkage errors.