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Poster
Multitask Boosting for Survival Analysis with Competing Risks
Alexis Bellot · Mihaela van der Schaar

Thu Dec 06 07:45 AM -- 09:45 AM (PST) @ Room 517 AB #143

The co-occurrence of multiple diseases among the general population is an important problem as those patients have more risk of complications and represent a large share of health care expenditure. Learning to predict time-to-event probabilities for these patients is a challenging problem because the risks of events are correlated (there are competing risks) with often only few patients experiencing individual events of interest, and of those only a fraction are actually observed in the data. We introduce in this paper a survival model with the flexibility to leverage a common representation of related events that is designed to correct for the strong imbalance in observed outcomes. The procedure is sequential: outcome-specific survival distributions form the components of nonparametric multivariate estimators which we combine into an ensemble in such a way as to ensure accurate predictions on all outcome types simultaneously. Our algorithm is general and represents the first boosting-like method for time-to-event data with multiple outcomes. We demonstrate the performance of our algorithm on synthetic and real data.

Author Information

Alexis Bellot (University of Cambridge)
Mihaela van der Schaar (University of Oxford)

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