Regression Discontinuity Design (RDD)

1. What is Regression Discontinuity Design (RDD)?

Regression Discontinuity Design (RDD) is a quasi-experimental method used to estimate a treatment effect when random assignment in an experiment is not possible. In RDD, a predetermined cutoff point, often based on a quantitative measure, is used to assign subjects to either a treatment or a control group. Unlike random assignment, RDD leverages a clear, pre-determined criterion to disting...