STATISTICS COLLOQUIUM
Yifei Sun
Assistant Professor
Department of Biostatistics
Columbia University
Dynamic Risk Prediction Triggered by Intermediate Events Using
Survival Tree Ensembles
Abstract
With the availability of massive amounts of data from electronic health records and registry databases, incorporating time-varying patient information to improve risk prediction has attracted great attention. To exploit the growing amount of predictor information over time, we develop a unified framework for landmark prediction using survival tree ensembles, where an updated prediction can be performed when new information becomes available. Compared to conventional landmark prediction with fixed landmark times, our methods allow the landmark times to be subject-specific and triggered by an intermediate clinical event. Moreover, the nonparametric approach circumvents the thorny issue of model incompatibility at different landmark times. In our framework, both the longitudinal predictors and the event time outcome are subject to right censoring, and thus existing tree-based approaches cannot be directly applied. To tackle the analytical challenges, we propose a risk-set-based ensemble procedure by averaging martingale estimating equations from individual trees. Extensive simulation studies are conducted to evaluate the performance of our methods. The methods are applied to the Cystic Fibrosis Patient Registry (CFFPR) data to perform dynamic prediction of lung disease in cystic fibrosis patients and to identify important prognosis factors.
Bio: Dr. Yifei Sun is an Assistant Professor in the Department of Biostatistics at Columbia University. She completed her PhD in biostatistic at Johns Hopkins University in 2015. Dr. Sun's methodological interest lies in biostatistical methodology, statistical learning in survival and longitudinal data analysis and their applications in medicine and epidemiology such as electronic health records and precision medicine.
Wednesday, April 27, 2022
4:00 pm EDT, 1-hour duration
Join by meeting number | Meeting number (access code): 2620 182 8603 | Meeting password: hrErWV2zq33 |
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For more information, contact: Tracy Burke at tracy.burke@uconn.edu