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from Part III - Fighting Nonignorable Nonresponse
Published online by Cambridge University Press: 29 February 2024
This chapter introduces selection models in a way that highlights important intuition about how they work. Section 8.1 formalizes the model we’ve been working with already. Section 8.2 uses the model to highlight a bad news, good news story. The bad news is that statistical estimation of a two-equation model like this will be challenging. The good news is that the model helps us recognize the traces nonignorable nonresponse leaves in observable data. Section 8.3 introduces the Heckman selection model. Section 8.4 uses the Heckman model to highlight the starkly different way that selection and weighting approaches use information. The Heckman model is far from perfect, however, as Section 8.5 explains.
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