Abrevaya, Jason; Dahl, Christian M - In: Journal of Business & Economic Statistics 26 (2008), pp. 379-397
Unobserved heterogeneity among childbearing women makes it difficult to isolate the causal effects of smoking and prenatal care on birth outcomes (such as birthweight). Whether a mother smokes, for instance, is likely to be correlated with unobserved characteristics of the mother. This article...