Research report

Direct and indirect effects under sample selection and outcome attrition

    01.08.2018

35

English This paper considers the evaluation of direct and indirect treatment effects, also known as mediation analysis, when outcomes are only observed for a subpopulation due to sample selection or outcome attrition. For identification, we combine sequential conditional independence assumptions on the assignment of the treatment and the mediator, i.e. the variable through which the indirect effect operates, with either selection on observables/missing at random or instrumental variable assumptions on the outcome attrition process. We derive expressions for the effects of interest that are based on inverse probability weighting by specific treatment, mediator, and/or selection propensity scores. We also provide a brief simulation study and an empirical illustration based on U.S. Project STAR data that assesses the direct effect and indirect effect (via absenteeism) of smaller kindergarten classes on math test scores.
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Faculty
Faculté des sciences économiques et sociales
Language
  • English
Classification
Economics
Other electronic version

Faculté SES

Series statement
  • Working Papers SES ; 496
License
License undefined
Identifiers
  • RERO DOC 322927
  • RERO R008834403
Persistent URL
https://folia.unifr.ch/unifr/documents/307154
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