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Efficient and flexible estimation of natural direct and indirect effects under intermediate confounding and monotonicity constraints

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  • Kara E. Rudolph
  • Nicholas Williams
  • Iván Díaz

Abstract

Natural direct and indirect effects are mediational estimands that decompose the average treatment effect and describe how outcomes would be affected by contrasting levels of a treatment through changes induced in mediator values (in the case of the indirect effect) or not through induced changes in the mediator values (in the case of the direct effect). Natural direct and indirect effects are not generally point‐identified in the presence of a treatment‐induced confounder; however, they may be identified if one is willing to assume monotonicity between the treatment and the treatment‐induced confounder. We argue that this assumption may be reasonable in the relatively common encouragement‐design trial setting, where the intervention is randomized treatment assignment and the treatment‐induced confounder is whether or not treatment was actually taken/adhered to. We develop efficiency theory for the natural direct and indirect effects under this monotonicity assumption, and use it to propose a nonparametric, multiply robust estimator. We demonstrate the finite sample properties of this estimator using a simulation study, and apply it to data from the Moving to Opportunity Study to estimate the natural direct and indirect effects of being randomly assigned to receive a Section 8 housing voucher—the most common form of federal housing assistance—on risk developing any mood or externalizing disorder among adolescent boys, possibly operating through various school and community characteristics.

Suggested Citation

  • Kara E. Rudolph & Nicholas Williams & Iván Díaz, 2023. "Efficient and flexible estimation of natural direct and indirect effects under intermediate confounding and monotonicity constraints," Biometrics, The International Biometric Society, vol. 79(4), pages 3126-3139, December.
    • Handle: RePEc:bla:biomet:v:79:y:2023:i:4:p:3126-3139
    DOI: 10.1111/biom.13850
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