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Title: Degree and centrality-based approaches in network-based variable selection: Insights from the Singapore longitudinal aging study
Authors: Valenzuela, J.F.B.
Monterola, C.
Tong, V.J.C. 
Fülöp, T.
Ng, T.P. 
Larbi, A. 
Issue Date: 2019
Publisher: Public Library of Science
Citation: Valenzuela, J.F.B., Monterola, C., Tong, V.J.C., Fülöp, T., Ng, T.P., Larbi, A. (2019). Degree and centrality-based approaches in network-based variable selection: Insights from the Singapore longitudinal aging study. PLoS ONE 14 (7) : e0219186. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: We describe a network-based method to obtain a subset of representative variables from clinical data of subjects of the second Singapore Longitudinal Aging Study (SLAS-2), while preserving to a good extent the predictive performance of the full set with regards to a multi-faceted index of successful aging, SAGE. To examine differences in predictive performance of high-degree nodes ("hubs") and high-centrality ones ("cores"), we implement four subsetting strategies (two degree-based, two centrality-based) and obtain four surrogate sets of variables, which we use as input features for machine learning models to predict the SAGE index of subjects. All four models have variables belonging to the physical, cardiovascular, cognitive and immunological domains among their fifteen most important predictors. A fifth domain (leisure-time activities, LTA) is also present in some form. From a comparison of the surrogate sets' size and predictive performance, a centrality-based approach (selection of the most central variable-nodes within each cluster) yielded the smallest-sized surrogate set, while having high prediction accuracy (measured by its model's area-under-curve, AUC) in comparison to its analogous degree-based strategy (selection of the highest-degree nodes per cluster). Inclusion of the next most-central variables yielded negligible changes in predictive performance while more than doubling the surrogate set size. The centrality-based approach thus yields a surrogate set which offers a good balance between number of variables and prediction performance, and can act as a representative subset of the SLAS-2 clinical dataset. © 2019 Valenzuela et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Source Title: PLoS ONE
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0219186
Rights: Attribution 4.0 International
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