To estimate a difference-in-differences it requires that one has a:
A) panel data set.
B) cross-sectional data set.
C) time series.
D) selected sample.

Question

Quizplus · Accepted Answer

Difference-in-differences (DD) requires a panel data set, which is a data set that collects data on the same set of individuals or entities at different time points. With panel data, one can compare the outcomes of treatment and control groups before and after treatment. DD analysis allows for a comparison of the change in outcomes for the treatment group with the change in outcomes for the control group, controlling for pre-treatment differences.

To Estimate a Difference-In-Differences It Requires That One Has A