When less conditioning provides better estimates: overcontrol and endogenous selection biases in research on intergenerational mobility

Michael Grätz ()
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Michael Grätz: Stockholm University

Quality & Quantity: International Journal of Methodology, 2022, vol. 56, issue 5, No 40, 3769-3793

Abstract: Abstract The counterfactual approach to causality has become the dominant approach to understand causality in contemporary social science research. Whilst most sociologists are aware that unobserved, confounding variables may bias the estimates of causal effects (omitted variable bias), the threats of overcontrol and endogenous selection biases are less well known. In particular, widely used practices in research on intergenerational mobility are affected by these biases. I review four of these practices from the viewpoint of the counterfactual approach to causality and show why overcontrol and endogenous selection biases arise when these practices are implemented. I use data from the German Socio-Economic Panel Study (SOEP) to demonstrate the practical consequences of these biases for conclusions about intergenerational mobility. I conclude that future research on intergenerational mobility should reflect more upon the possibilities of bias introduced by conditioning on variables.

Keywords: Causality; Directed acyclic graphs; Endogenous selection bias; Intergenerational mobility; Overcontrol bias (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11135-021-01310-8

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