This monograph presents a brief overview of the literature on the difference-in-difference estimation strategy and discusses major issues mainly using a treatme

Myoung-jae Lee reviews the three most popular methods (and their extensions) in applied economics and other social sciences: matching, regression discontinuity,

This text presents statistical methods for studying causal effects and discusses how readers can assess such effects in simple randomized experiments.

There are approximately 4,000 fatalities in crashes involving trucks and buses in the United States each year. Though estimates are wide-ranging, possibly 10 to