BIOSTATISTICS SEMINAR SERIES

Xiaochun Li, Ph.D.
Associate Professor, Department of Biostatistics, School of Medicine, Fairbanks School of Public Health, Indiana University

Title: A Machine Learning Approach to Causal Inference in the Presence of Missing Data

Abstract: Observational medical databases increasingly find uses for comparative effectiveness and safety research. However, the lack of analytic methods that simultaneously handle the issues of missing data and confounding bias along with the onus of model specification, limit the use of these valuable data sources. We derived a novel machine-learning approach based on trees to estimate the average treatment effect. In order to evaluate causal estimation by model-free machine-learning methods in data with incomplete observations, we conducted a simulation study with data generated from known models of exposure, outcome and missing mechanisms. Thus the true causal effect was known and used as the benchmark for evaluations. Two settings were studied. We compared the bias and standard error of causal estimates from our method to a multiply robust parametric method, the complete case analysis (CC) and a regression analysis after multiple imputations (MI). The proposed methods were applied to a real observational data set of implantable cardioverter defibrillator use.

Bio3 Seminar Series sponsored by 
Department of Biostatistics, Bioinformatics & Biomathematics (DBBB)

Friday, September 13 at 10:00am to 11:00am


Medical and Dental Building, Proctor Harvey, C104
3900 Reservoir Road, N.W., Washington

Event Type

Academic Events

Audience

Students, Faculty/Staff

Departments

Georgetown University Medical Center, Lombardi Comprehensive Cancer Center, Biomedical Graduate Education, Biostatistics Graduate Program

Website

https://biostatistics.georgetown.edu/...

Presenter

Xiaochun Li, Ph.D.

Event Contact Name

Veronica Chiu

Event Contact Email

dbbb@georgetown.edu

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