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coefficient on wit is t ai. Can eliminate ai (and ci0. Or, with t , can “estimate” the i and then use

N

  • ̂  N1 ̂i.

i1

See Wooldridge (2002, Section 11.2) for standard error, or bootstrapping. 5. Semiparametric and Nonparametric Approaches Return to the setting with two groups and two time periods. Athey and Imbens (2006) generalize the standard DD model in several ways. Let the two time periods be t 0 and 1 and label the two groups g 0 and 1. Let Yi0be the counterfactual outcome in the absense of intervention and Yi1the counterfactual outcome with intervention. AI

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