Moshe Adler, a professor at Columbia University, has emerged as one of the most incisive critics of the work of Raj Chetty, John Friedman, and Jonah Rockoff on Value-added measurement (VAM). In the recent Vergara decision about tenure for teachers in California, the study by Raj Chetty and John Friedman of Harvard and Jonah Rockoff … Continue reading Columbia Scholar Says Chetty, Friedman, and Rockoff Are Wrong About VAM