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This is not testable with two periods but its testable with more. Some ... Earnings for period 1959-69 ... Can use other periods to see if this assumption is ...
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Difference pre-treatment is ... have this individuals observed pre- and post-treatment may be ... perfectly multicollinear with individual fixed effect ...
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Differences-in-Differences. and A Brief Introduction to Panel Data. John Snow again... Sometimes different companies supplied households in same street ...
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Interested in effect of vertical integration on retail petrol prices ... of petrol stations by ARCO (more integrated) Treatment Group: petrol stations 1mi ...
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