The New York Times | Martin West, Associate Professor of Education, comments on a recent research finding unusually large negative effects of vouchers on children's test scores in Louisiana.
The article also cites research by Raj Chetty, John Friedman, and Jonah Rockoff (PhD '04, now Columbia Business School) linking teachers' impacts on test scores (teacher value-added) to improved adult outcomes on a variety of measures.
And it notes that "the new voucher studies stand in marked contrast to research findings that well-regulated charter schools in Massachusetts and elsewhere have a strong, positive impact on test scores," citing research by Sarah Cohodes (PhD '15, now Columbia Teachers College) and collaborators. Cohodes and Susan Dynarski summarize the evidence in a 2016 Brookings Institution report, "Massachusetts charter cap holds back disadvantaged students."