Clarke, Paul S.; Windmeijer, Frank - In: Journal of the American Statistical Association 107 (2012) 500, pp. 1638-1652
Instrumental variables (IVs) can be used to construct estimators of exposure effects on the outcomes of studies affected by nonignorable selection of the exposure. Estimators that fail to adjust for the effects of nonignorable selection will be biased and inconsistent. Such situations commonly...