This article derives an equation characterizing the difference between OLS and IV coefficients under potentially heterogenous treatment effects. This leads to what I call the Coefficient Difference Check, which consists of checking that the difference between the estimated OLS and IV...

This paper tests the linkage between a binary treatment (rural road improvement project) and a continuous outcome (cotton productivity) in Zambia's agro-based Eastern Province as measured by repeated cross-sections of farm-level data from the Zambian post-harvest survey (PHS). We use this PHS...

This paper tests the linkage between a binary treatment (rural road improvement project) and a continuous outcome (cotton productivity) in Zambia’s agro-based Eastern Province as measured by repeated cross-sections of farm-level data from the Zambian post-harvest survey (PHS). We use this PHS...