Causal Inference and the Heckman Model

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Shadow Education, American Style: Test Preparation, the SAT and College Enrollment (2010, unknown): “Thus, we include controls to account for potential selection into test preparation -that is, to account for factors besides family income and parental education that likely shape students' use of test prep (see Briggs 2004).”
Controlling for endogeneity with instrumental variables in strategic management research (2008, background): “…partially the two conditions mentioned in their definition, the resulting estimates of the second step are imprecise and thus likely unreliable, because of potentially severe collinearity problems (see Briggs, 2004; Hamilton and Nickerson, 2003; LaLonde, 1986; Little, 1985; Sales et al., 2004).”