Vertical case discussion (案例纵向讨论)
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1. [Slides] Topic 16: Vertical case discussions and critiques of panel data models
2. [case materials] Royer (AEJ, 2009)
Heather Royer, 2009. “Separated at Girth: US Twin Estimates of the Effects of Birth weight,” American Economic Journal: Applied Economics, vol. 1., no. 1.

