Although existing research suggests that students benefit on a range of outcomes when they enroll in early algebra classes, policy efforts that accelerate algebra enrollment for large numbers of students often have negative effects. Explanations for this apparent contradiction often emphasize the potential role of teacher and peer effects, which…

We present new estimates of the importance of teachers in early grades for later grade outcomes, but unlike the existing literature that examines teacher "fade-out," we directly compare the contribution of early-grade teachers to later year outcomes against the contributions of later year teachers to the same later year outcomes. Where…

Teachers' impact on student long-run success is only partially explained by their contributions to students' short-run academic performance. For this study, we explore a second dimension of teacher effectiveness by creating measures of teachers' contributions to student class-attendance. We find systematic variation in teacher effectiveness at…

Having good teachers in the classroom matters, and in recent years better data have helped researchers more accurately measure individual teachers' effects on their pupils. A novel RAND study goes further, finding that teachers' effectiveness (or lack thereof) ripples out beyond their own students and affects the educational experiences of their…

When students look back on their most important teachers, the social aspects of their education are often what they recall. Learning to set goals, take risks and responsibility, or simply believe in oneself are often fodder for fond thanks--alongside mastering precalculus, becoming a critical reader, or remembering the capital of Turkmenistan. The…

Responding to an Illinois law that took effect in 2010, the Performance Evaluation Reform Act (PERA), Chicago Public Schools (CPS) created and implemented the REACH (Recognizing Educators Advancing Chicago's Students) educator evaluation and support system. REACH was piloted in 2012-13. It is still being implemented as of the 2019-20 school year,…

Researchers using VAM (Value-Added Models) methods have found that student achievement is substantially impacted by both schools and teachers. However, most of this work has been conducted within the context of the United States. Information is lacking about the educational system in China. This first study examines methodological concerns…

The single best predictor of who will be a great teacher next year is who was a great teacher this year. Some great teachers are seasoned veterans, while some are new to the field. Experience matters, of course, particularly in the early years of a teaching career, but it's no guarantee of teacher effectiveness. There is a wide variation in…

Evidence that teachers' short-term instructional effects persist over time and predict substantial long-run impacts on students' lives provides much of the impetus for a wide range of educational reforms focused on identifying and responding to differences in teachers' value-added to student learning. However, relatively little research has…

Value-added modeling (VAM), one class of statistical models used to estimate individual teacher's or school's contribution to student achievement based on student test score growth between consecutive years, has become increasingly popular in the last decades. Despite the increasing popularity of VAM, many researchers are concerned about the…

Unlike in elementary school, high-school teacher effects may be confounded with both selection to tracks and unobserved track-level treatments. I document sizable confounding track effects, and show that traditional tests for the existence of teacher effects are likely biased. After accounting for these biases, high-school algebra and English…