Unobservable Selection and Coefficient Stability: Theory and Evidence

2017 ◽  
Vol 37 (2) ◽  
pp. 187-204 ◽  
Author(s):  
Emily Oster
1976 ◽  
Author(s):  
Marvin Marcus ◽  
Henryk Minc ◽  
Robert C. Thompson

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