Bertrand, Marianne (contributor); Duflo, Esther (contributor) - 2001 - [Elektronische Ressource]
especially troubling because the independent variable of interest in DD estimation (e.g., the passage of law) is itself very … biased: with about 20 years of data, DD estimation finds an "effect" significant at the 5% level of up to 45% of the placebo …
