Education research has experienced a methodological renaissance over the past two
decades, with a new focus on large-scale randomized experiments. This wave of …

Evaluations of public programs in many fields reveal that different types of programs—or
different versions of the same program—vary in their effectiveness. Moreover, a program that …

For students whose math skills lag expectations, public schools often increase the fraction of
the school day spent on math instruction. Studying middle-school students and using …

We examine the impacts of a private need-based college financial aid program distributing
grants at random among first-year Pell Grant recipients at thirteen public Wisconsin …

In policy evaluations, interest may focus on why a particular treatment works. One tool for
understanding why treatments work is causal mediation analysis. In this essay, I focus on the …

The present article provides a synthesis of the conceptual and statistical issues involved in
using multisite randomized trials to learn about and from a distribution of heterogeneous …

How should schools assign students to more rigorous math courses so as best to help their
academic outcomes? We identify several hundred California middle schools that used 7th …

Multisite trials can clarify the average impact of a new program and the heterogeneity of
impacts across sites. Unfortunately, in many applications, compliance with treatment …

This study aims to test the theory underlying Job Corps, one of the largest education and
training programs in the US serving disadvantaged youth. Central to the program are …

Within each of 170 physicians, patients were randomized to access e‐assist, an online
program that aimed to increase colorectal cancer screening (CRCS), or control. Compliance …