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C I C E Y 1 1 E F 0 1 1 F 0 0 Y 1 0 .

Other approaches with panel data: Altonji and Matzkin (2005) under exchaneability in DUi|Wi1, . . . , WiT. Heckman, Ichimura, Smith, and Todd (1997) and Abadie (2005). Consider basic setup with two time periods, no treated units in first time period. Without an i subscript, Ytwis the counterfactual outcome for treatment level w, w 0, 1, at time t. Parameter: the average treatment effect on the treated,

  • ATT EY11Y10|W 1.

Remember, in the current setup, no units are treated in the initial time period, so W 1 means treatment in the second time period.

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