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| Prova de placebo en la investigació educativa× | Diferència en Diferències (Diff-in-Diff)× | |
|---|---|---|
| Camp≠ | Inferència causal | Econometria |
| Família | Regression model | Regression model |
| Any d'origen≠ | 1990s–2000s | 1994 |
| Autor original≠ | Widely adopted in applied econometrics and education research; codified by Imbens, Wooldridge, Lee, and Lemieux | Card & Krueger (canonical 1994 application); Angrist & Pischke (textbook treatment) |
| Tipus≠ | Falsification / robustness check | Causal inference / panel regression |
| Font seminal≠ | Imbens, G. W., & Wooldridge, J. M. (2009). Recent Developments in the Econometrics of Program Evaluation. Journal of Economic Literature, 47(1), 5-86. DOI ↗ | Angrist, J. D., & Pischke, J.-S. (2009). Mostly Harmless Econometrics: An Empiricist's Companion. Princeton University Press. ISBN: 978-0691120355 |
| Àlies≠ | placebo regression, falsification test, placebo check, fake-treatment test | diff-in-diff, DiD, Farkların Farkı (Diff-in-Diff) |
| Relacionats≠ | 4 | 5 |
| Resum≠ | A placebo test is a falsification check used in quasi-experimental education research to validate a causal design. By applying the same estimator to a time period, group, or outcome where no real effect should exist, researchers verify that their identification strategy is not picking up spurious patterns. A statistically significant placebo estimate signals a flaw in the design, while a null result supports its credibility. | 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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