Estimating treatment effects using difference-in-differences requires what kind of data?
A)aggregate measures over time
B)time-series data spanning the treatment length
C)paired,panel data
D)cross-section spanning the treated population

Question

Quizplus · Accepted Answer

Difference-in-differences requires paired, panel data where one group receives treatment and another group does not receive treatment, and both groups are observed over time. This allows us to estimate the treatment effect by comparing the change in outcomes between the treated and control group before and after the treatment. Aggregate measures over time (A) or cross-section spanning the treated population (D) may not provide adequate comparison groups, and time-series data spanning the treatment length (B) may not provide a clear control group.

Estimating Treatment Effects Using Difference-In-Differences Requires What Kind of Data