Difference-in-Difference 101

What is Difference-in-difference (DiD or DD or diff-in-diff)? Why do we care about DiD? Today I will answer all the questions about one of the most popular methods in econometrics to study a policy effect.

Image created by the author using DALL.E. The image attempts to show the introduction of technology such as tablets in the classroom and its effect on grades.

DiD is a widely used econometric technique that estimates causal relationships by comparing the changes in outcomes over …

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