[HTML][HTML] Effects of SVM parameter optimization on discrimination and calibration for post-procedural PCI mortality

ME Matheny, FS Resnic, N Arora… - Journal of Biomedical …, 2007 - Elsevier
Journal of Biomedical Informatics, 2007Elsevier
Support vector machines (SVM) have become popular among machine learning
researchers, but their applications in biomedicine have been somewhat limited. A number of
methods, such as grid search and evolutionary algorithms, have been utilized to optimize
model parameters of SVMs. The sensitivity of the results to changes in optimization methods
has not been investigated in the context of medical applications. In this study, radial-basis
kernel SVM and polynomial kernel SVM mortality prediction models for percutaneous …
Support vector machines (SVM) have become popular among machine learning researchers, but their applications in biomedicine have been somewhat limited. A number of methods, such as grid search and evolutionary algorithms, have been utilized to optimize model parameters of SVMs. The sensitivity of the results to changes in optimization methods has not been investigated in the context of medical applications. In this study, radial-basis kernel SVM and polynomial kernel SVM mortality prediction models for percutaneous coronary interventions were optimized using (a) mean-squared error, (b) mean cross-entropy error, (c) the area under the receiver operating characteristic, and (d) the Hosmer–Lemeshow goodness-of-fit test (HL χ2). A threefold cross-validation inner and outer loop method was used to select the best models using the training data, and evaluations were based on previously unseen test data. The results were compared to those produced by logistic regression models optimized using the same indices. The choice of optimization parameters had a significant impact on performance in both SVM kernel types.
Elsevier
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