Value-added models of teacher effectiveness yield consistent estimates of teacher quality under the assumption that students are randomly assigned to classrooms conditional on ability. Rothstein (2010) tested and rejected this underlying sort- ing assumption, casting doubt on the usefulness of...

This paper investigates how the precision and stability of a teacher's value-added estimate relates to the characteristics of the teacher's students. Using a large administrative data set and a variety of teacher value-added estimators, it finds that the stability over time of teacher...

We examine the role of teachers and students in the formation of test scores at the higher secondary level (grade 12) in public schools in Delhi, India. Using the value added approach, we find substantial variation in teacher and student quality within schools: over the period spanning grades 11...

We examine the role of teachers and students in the formation of grade 12 test scores in public schools in Delhi. There is substantial variation in teacher and student quality within schools. Over the period spanning grades 11 and 12, being taught by a standard deviation better than average...