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Activity Number: 85 - 20 Years of Principal Stratification: Where to Now?
Type: Invited
Date/Time: Monday, August 8, 2022 : 8:30 AM to 10:20 AM
Sponsor: Health Policy Statistics Section
Abstract #320367
Title: Jointly Utilizing Parametric and Nonparametric Identification of Principal Causal Effects
Author(s): Booil Jo*
Companies: Stanford University
Keywords: Gaussian mixtures; principal stratification; moving exclusion restriction; parametric identification ; nonparametric identification ; diagnostic test

Given the latent stratum membership, principal stratification models with continuous outcomes naturally fit in the parametric estimation framework of Gaussian mixtures. The main problem with using the parametric mixture modeling approach is that it is hard to assess the quality of principal effect estimates given its reliance on parametric conditions. As a way of assessing the estimation quality in this situation, this study proposes that we use parametric mixture modeling in two different ways, with and without the assurance of nonparametric identification. The key identifying assumption employed in this study is the moving exclusion restriction, a flexible version of the standard exclusion restriction assumption. This assumption is used as a temporary vehicle to help assess the quality of principal effect estimates obtained relying on parametric mixture modeling. The study presents promising results, showing the possibility of using parametric mixture modeling as an accessible tool for causal inference.

Authors who are presenting talks have a * after their name.

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