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**Hierarchical infinite factor models for improving the prediction of surgical complications for geriatric patients.**
*(English)*
Zbl 1435.62395

Summary: Nearly a third of all surgeries performed in the United States occur for patients over the age of 65; these older adults experience a higher rate of postoperative morbidity and mortality. To improve the care for these patients, we aim to identify and characterize high risk geriatric patients to send to a specialized perioperative clinic while leveraging the overall surgical population to improve learning. To this end, we develop a hierarchical infinite latent factor model (HIFM) to appropriately account for the covariance structure across subpopulations in data. We propose a novel Hierarchical Dirichlet Process shrinkage prior on the loadings matrix that flexibly captures the underlying structure of our data while sharing information across subpopulations to improve inference and prediction. The stick-breaking construction of the prior assumes an infinite number of factors and allows for each subpopulation to utilize different subsets of the factor space and select the number of factors needed to best explain the variation. We develop the model into a latent factor regression method that excels at prediction and inference of regression coefficients. Simulations validate this strong performance compared to baseline methods. We apply this work to the problem of predicting surgical complications using electronic health record data for geriatric patients and all surgical patients at Duke University Health System (DUHS). The motivating application demonstrates the improved predictive performance when using HIFM in both area under the ROC curve and area under the PR Curve while providing interpretable coefficients that may lead to actionable interventions.

### MSC:

62P10 | Applications of statistics to biology and medical sciences; meta analysis |

62M20 | Inference from stochastic processes and prediction |

62G05 | Nonparametric estimation |

### Keywords:

Bayesian factor model; nonparametrics; transfer learning; hierarchical modeling; surgical outcomes; health care
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\textit{E. Lorenzi} et al., Ann. Appl. Stat. 13, No. 4, 2637--2661 (2019; Zbl 1435.62395)

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