Format
A data.frame
with 318 observations on the following 5 variables). enrollment: Enrolled number of students in each cohort pct_disadv: Percentage of students that are economically disadvantaged. classsize: Size of class or classes for each cohort. avgmath: Average math test score for each class. z: A recode of enrollment with 1 indicating a cohort with 41 or more students, i.e. two classes.
This serves as the instrument which encourages smaller classes. Source
Angrist, Joshua and Lavy, Victor (1999). ``Using Maimonides' Rule to
Estimate the Effect of Class Size on Scholastic
Achievement.'' Quarterly Journal of Economics 114, 533--575. Rosenbaum, Paul R. (2010). Design of Observational Studies.
Springer-Verlag.