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| Impact Evaluation Design× | Différence-en-différences (Diff-in-Diff)× | |
|---|---|---|
| Domaine≠ | Public Policy | Économétrie |
| Famille≠ | Process / pipeline | Regression model |
| Année d'origine≠ | 2016 | 1994 |
| Auteur d'origine≠ | Development and program-evaluation community; codified by Gertler et al. (World Bank) | Card & Krueger (canonical 1994 application); Angrist & Pischke (textbook treatment) |
| Type≠ | Design framework for causal impact evaluation | Causal inference / panel regression |
| Source fondatrice≠ | Gertler, P. J., Martinez, S., Premand, P., Rawlings, L. B., & Vermeersch, C. M. J. (2016). Impact Evaluation in Practice (2nd ed.). Washington, DC: World Bank. ISBN: 9781464807794 | Angrist, J. D., & Pischke, J.-S. (2009). Mostly Harmless Econometrics: An Empiricist's Companion. Princeton University Press. ISBN: 978-0691120355 |
| Alias | Impact Evaluation, Causal Impact Evaluation Design, Counterfactual Evaluation Design | diff-in-diff, DiD, Farkların Farkı (Diff-in-Diff) |
| Apparentées≠ | 3 | 5 |
| Résumé≠ | Impact evaluation design is the upstream task of structuring an evaluation so that it can credibly attribute changes in outcomes to a policy or program rather than to other factors. Its defining concern is the counterfactual: what would have happened to participants in the absence of the intervention. Codified in resources such as the World Bank's Impact Evaluation in Practice, the design process selects an identification strategy — randomised assignment, or a quasi-experimental method such as difference-in-differences, regression discontinuity, instrumental variables or matching — that constructs a valid comparison and yields an unbiased estimate of the intervention's effect. | Difference-in-Differences is a causal-inference method that estimates the effect of an intervention by comparing how a treatment group and a control group change over time. Made famous by Card and Krueger's 1994 minimum-wage study and developed in Angrist and Pischke's Mostly Harmless Econometrics, it isolates the treatment effect as the difference between the two groups' before-after changes. |
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