Many empirical studies specify outcomes as a linear function of endogenous regressors when conducting instrumental variable (IV) estimation. We show that tests for treatment effects, selection bias, and treatment effect heterogeneity are biased if the true relationship is non-linear. These...

The linear IV estimator, in which the dependent variable is a linear function of a potentially endogenous regressor, is a major workhorse in empirical economics. When this regressor takes on multiple values, the linear specification restricts the marginal effects to be constant across all...

The interpretation of instrumental variables (IV) estimates as local average treatment effects (LATE) of instrument-induced shifts in treatment raises concerns about their external validity and policy relevance. We examine how to move beyond LATE in situations where the instrument is discrete,...

We evaluate the effectiveness of small high school reform in the country’s largest school district, New York City. Using a rich administrative dataset for multiple cohorts of students and distance between student residence and school to instrument for endogenous school selection, we find...

In this paper we utilize a model of household investments in the cognitive development of children to explore the impact of various transfer policies on the distribution of child cognitive outcomes in target populations. We develop a cost criterion that can be used to compare the cost...

An extensive literature finds that while teachers vary considerably in initial quality there are limited teacher quality dynamics: except for the first few years of teaching, teacher quality does not improve over the course of a teacher's career. This study evaluates the importance of various...

In this paper we utilize a model of household investments in the cognitive development of children to explore the impact of various transfer policies on the distribution of child cognitive outcomes in target populations. We develop a cost criterion that can be used to compare the cost...

The growth in labor market participation among women with young children has raised concerns about the potential negative impact of the mother's absence from home on child outcomes. Recent data show that mother's time spent with children has declined in the last decade, while the indicators of...