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  3. Recanting Twins: Addressing Intermediate Confounding In Mediation Analysis.
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  3. Recanting Twins: Addressing Intermediate Confounding In Mediation Analysis.

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Recanting Twins: Addressing Intermediate Confounding in Mediation Analysis.

Tat-Thang Vo1, Nicholas Williams2, Richard Liu3

  • 1Research Group EPIDERME, Institute Mondor of Biomedical Research, INSERM U955, University Paris Est Créteil, Créteil, France.

Statistics in Medicine
|February 5, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Intermediate confounders challenge causal mediation analysis. This study introduces "recanting twin effects" as a robust alternative, enabling accurate path-specific effect estimation even with complex confounding. This advances causal inference methods.

Keywords:
intermediate confoundingmediation analysispath‐specific effectsrecanting witnesssemiparametric theory

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Area of Science:

  • Causal Inference
  • Mediation Analysis
  • Epidemiology

Background:

  • Intermediate confounders, or "recanting witnesses," pose a significant challenge in mediation analysis, hindering the identification of natural path-specific effects.
  • Existing alternatives like randomizational interventional effects may yield misleading results, showing effects even without true mediation.

Purpose of the Study:

  • To formally develop "recanting twin effects" as a viable alternative to natural effects in mediation analysis under intermediate confounding.
  • To provide tools for testing intermediate confounding and interpreting new causal parameters.

Main Methods:

  • Proposed a falsification procedure to detect intermediate confounding.
  • Demonstrated the equivalence of recanting twin effects and natural effects in the absence of intermediate confounding.
  • Developed non-parametric efficiency theory, including efficiency bounds and efficient estimators for high-dimensional confounders using data-adaptive methods.

    • Main Results:

    • Recanting twin effects offer a robust framework for mediation analysis with intermediate confounding.
    • The study provides a method to test for intermediate confounding.
    • Developed efficient estimators applicable to high-dimensional data.

    Conclusions:

    • Recanting twin effects provide a theoretically sound and practically applicable alternative for mediation analysis when intermediate confounding is present.
    • The developed methods and estimators enhance the ability to investigate causal mechanisms in complex observational data.