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Negative ability bias from conditioning on a confounded mediator: A directed interaction test and case study.

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Sociologists face endogenous selection bias in mediation analysis. A new negative ability bias, linked to unobserved abilities, explains disappearing income returns for Chinese Communist Party members.

Keywords:
ColliderEndogenous selection biasMediation analysisNegative ability biasPolitical capital

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Area of Science:

  • Sociology
  • Econometrics
  • Causal Inference

Background:

  • Endogenous selection bias is a recognized problem in sociological mediation analysis.
  • Unobserved abilities can confound mediators like job attributes, creating a negative ability bias.
  • This bias can distort findings in sociological models of economic outcomes.

Purpose of the Study:

  • To identify and address a specific type of endogenous selection bias: negative ability bias.
  • To develop a novel statistical test for detecting this bias.
  • To re-examine the paradox of Communist Party Premiums in China using the proposed methodology.

Main Methods:

  • Building on the Elwert and Winship (2014) sub-model.
  • Utilizing simulation studies to demonstrate bias amplification with collider selectivity.
  • Developing and applying a directed interaction test for bias detection.

Main Results:

  • Simulations confirm that bias size increases with collider selectivity under common assumptions.
  • The directed interaction test effectively detects the proposed negative ability bias.
  • Re-examination of Chinese Communist Party Premiums data reveals results consistent with the negative ability bias hypothesis.

Conclusions:

  • A significant, overlooked negative ability bias affects sociological models of economic outcomes.
  • The directed interaction test provides a tool for identifying and potentially mitigating this bias.
  • The bias may explain the recent disappearance of income returns for Chinese Communist Party members, challenging previous findings.