Cited by 4,143Advanced Causal Inference TechniquesStatistical Methods and Bayesian InferencePhilosophy and History of Science

A general approach to causal mediation analysis.

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Imai, Kosuke, Keele, Luke, Tingley, Dustin·2010·Psychological Methods

Abstract

Traditionally in the social sciences, causal mediation analysis has been formulated, understood, and implemented within the framework of linear structural equation models. We argue and demonstrate that this is problematic for 3 reasons: the lack of a general definition of causal mediation effects independent of a particular statistical model, the inability to specify the key identification assumption, and the difficulty of extending the framework to nonlinear models. In this article, we propose an alternative approach that overcomes these limitations. Our approach is general because it offers the definition, identification, estimation, and sensitivity analysis of causal mediation effects without reference to any specific statistical model. Further, our approach explicitly links these 4 elements closely together within a single framework. As a result, the proposed framework can accommodate linear and nonlinear relationships, parametric and nonparametric models, continuous and discrete mediators, and various types of outcome variables. The general definition and identification result also allow us to develop sensitivity analysis in the context of commonly used models, which enables applied researchers to formally assess the robustness of their empirical conclusions to violations of the key assumption. We illustrate our approach by applying it to the Job Search Intervention Study. We also offer easy-to-use software that implements all our proposed methods.

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Crossref · 10.1037/a0020761

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Authors
Imai, K., Keele, L., & Tingley, D.
Affiliations
  • Princeton University (US)
  • The Ohio State University (US)
  • Harvard University (US)
Venue
Psychological Methods
Published
2010
Volume
15
Issue
4
Pages
309-334
ISSN
  • 1082-989X (ISSN-L)
  • 1939-1463
OpenAlex
W2010143351
Cited by
4,143
References
65
Citations by year
2026: 736 · 2025: 494 · 2024: 385 · 2023: 352 · 2022: 353 · 2021: 327 · 2020: 317 · 2019: 232 · 2018: 218 · 2017: 186 · 2016: 146 · 2015: 129 · 2014: 110 · 2013: 64 · 2012: 54
FWCI
42.48
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Psychological Methods (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
National Science Foundation (SES-0918968)
Topics
  • Physical Sciences › Mathematics › Statistics and Probability › Advanced Causal Inference Techniques
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Bayesian Inference
  • Social Sciences › Arts and Humanities › History and Philosophy of Science › Philosophy and History of Science
Keywords
causal mediation analysis, identification assumptions, sensitivity analysis, model-free estimation
MeSH terms
Algorithms, Data Interpretation, Statistical, Sensitivity and Specificity, Social Sciences, Models, Statistical, Causality, Linear Models

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