The Effects of Sampling Methods on Machine Learning Models for Predicting Long-term Length of Stay: A Case Study of Rhode Island Hospitals

The Effects of Sampling Methods on Machine Learning Models for Predicting Long-term Length of Stay: A Case Study of Rhode Island Hospitals

Son Nguyen, Alicia T. Lamere, Alan Olinsky, John Quinn
Copyright: © 2019 |Pages: 17
DOI: 10.4018/IJRSDA.2019070103
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Abstract

The ability to predict the patients with long-term length of stay (LOS) can aid a hospital's admission management, maintain effective resource utilization and provide a high quality of inpatient care. Hospital discharge data from the Rhode Island Department of Health from the time period between 2010 to 2013 reveals that inpatients with long-term stays, i.e. two weeks or more, costs about six times more than those with short stays while only accounting for 4.7% of the inpatients. With the imbalance in the distribution of long-stay patients and short-stay patients, predicting long-term LOS patients becomes an imbalanced classification problem. Sampling methods—balancing the data before fitting it to a traditional classification model—offer a simple approach to the problem. In this work, the authors propose a new resampling method called RUBIES which provides superior predictive ability when compared to other commonly used sampling techniques.
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Background

Critical to the prediction of long-term LOS is the handling of the imbalanced data concern. For this reason, the majority of this section is devoted to a discussion of resampling techniques. The tree-based classification models that were used to compare the authors’ proposed resampling method’s performance are also discussed.

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