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Simple Diagnostics for Two-Way Fixed Effects

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 نشر من قبل Pamela Jakiela
 تاريخ النشر 2021
  مجال البحث اقتصاد مالية
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 تأليف Pamela Jakiela




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Difference-in-differences estimation is a widely used method of program evaluation. When treatment is implemented in different places at different times, researchers often use two-way fixed effects to control for location-specific and period-specific shocks. Such estimates can be severely biased when treatment effects change over time within treated units. I review the sources of this bias and propose several simple diagnostics for assessing its likely severity. I illustrate these tools through a case study of free primary education in Sub-Saharan Africa.



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