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Estimation and Inference for the Mediation Proportion

Author

Listed:
  • Nevo Daniel

    (Departments of Biostatistics and Epidemiology, Harvard University T H Chan School of Public Health, Boston, Massachusetts 02115, USA)

  • Liao Xiaomei

    (Departments of Biostatistics and Epidemiology, Harvard University T H Chan School of Public Health, Boston, Massachusetts 02115, USA; Currently employed at AbbVie Inc. North Chicago 60064, Illinois, USA)

  • Spiegelman Donna

    (Departments of Biostatistics, Epidemiology, Nutrition and Global Health, Harvard University T H Chan School of Public Health, Boston, Massachusetts 02115, USA)

Abstract

In epidemiology, public health and social science, mediation analysis is often undertaken to investigate the extent to which the effect of a risk factor on an outcome of interest is mediated by other covariates. A pivotal quantity of interest in such an analysis is the mediation proportion. A common method for estimating it, termed the “difference method”, compares estimates from models with and without the hypothesized mediator. However, rigorous methodology for estimation and statistical inference for this quantity has not previously been available. We formulated the problem for the Cox model and generalized linear models, and utilize a data duplication algorithm together with a generalized estimation equations approach for estimating the mediation proportion and its variance. We further considered the assumption that the same link function hold for the marginal and conditional models, a property which we term “g-linkability”. We show that our approach is valid whenever g-linkability holds, exactly or approximately, and present results from an extensive simulation study to explore finite sample properties. The methodology is illustrated by an analysis of pre-menopausal breast cancer incidence in the Nurses’ Health Study. User-friendly publicly available software implementing those methods can be downloaded from the last author’s website (SAS) or from CRAN (R).

Suggested Citation

  • Nevo Daniel & Liao Xiaomei & Spiegelman Donna, 2017. "Estimation and Inference for the Mediation Proportion," The International Journal of Biostatistics, De Gruyter, vol. 13(2), pages 1-18, November.
  • Handle: RePEc:bpj:ijbist:v:13:y:2017:i:2:p:18:n:6
    DOI: 10.1515/ijb-2017-0006
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    References listed on IDEAS

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    1. David P. Mackinnon & James H. Dwyer, 1993. "Estimating Mediated Effects in Prevention Studies," Evaluation Review, , vol. 17(2), pages 144-158, April.
    2. Steen, Johan & Loeys, Tom & Moerkerke, Beatrijs & Vansteelandt, Stijn, 2017. "medflex: An R Package for Flexible Mediation Analysis using Natural Effect Models," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 76(i11).
    3. Tingley, Dustin & Yamamoto, Teppei & Hirose, Kentaro & Keele, Luke & Imai, Kosuke, 2014. "mediation: R Package for Causal Mediation Analysis," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 59(i05).
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