Sample Selection Bias

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A Sample Selection Approach to Censored Demand Systems (2006, methodology): “Yen (2005) recently proposed a maximum likelihood (ML) procedure for the multivariate sample selection model (MSSM), an extension of the bivariate sample selection model (Heckman 1979), which had motivated the procedures of Heien and Wessells (1990) and Shonkwiler and Yen (1999).”
Differences in opportunities? Wage, unemployment and house-price effects on migration (2010, unknown): “As women in paid employment may not be a randomly selected sample of the population, we correct their regional wage estimates for selection into employment using a Heckman (1979) two step estimation approach.”