Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/35963
Title: Resampling methods improve the predictive power of modeling in class-imbalanced datasets
Authors: Lee, PH 
Keywords: Automated classifier
Data mining
Decision tree
Oversampling
Predictive power
Rare events
Issue Date: 2014
Publisher: Molecular Diversity Preservation International (MDPI)
Source: International journal of environmental research and public health, 2014, v. 11, no. 9, p. 9776-9789 How to cite?
Journal: International journal of environmental research and public health 
Abstract: In the medical field, many outcome variables are dichotomized, and the two possible values of a dichotomized variable are referred to as classes. A dichotomized dataset is class-imbalanced if it consists mostly of one class, and performance of common classification models on this type of dataset tends to be suboptimal. To tackle such a problem, resampling methods, including oversampling and undersampling can be used. This paper aims at illustrating the effect of resampling methods using the National Health and Nutrition Examination Survey (NHANES) wave 2009-2010 dataset. A total of 4677 participants aged >= 20 without self-reported diabetes and with valid blood test results were analyzed. The Classification and Regression Tree (CART) procedure was used to build a classification model on undiagnosed diabetes. A participant demonstrated evidence of diabetes according to WHO diabetes criteria. Exposure variables included demographics and socio-economic status. CART models were fitted using a randomly selected 70% of the data (training dataset), and area under the receiver operating characteristic curve (AUC) was computed using the remaining 30% of the sample for evaluation (testing dataset). CART models were fitted using the training dataset, the oversampled training dataset, the weighted training dataset, and the undersampled training dataset. In addition, resampling case-to-control ratio of 1: 1, 1: 2, and 1: 4 were examined. Resampling methods on the performance of other extensions of CART (random forests and generalized boosted trees) were also examined. CARTs fitted on the oversampled (AUC = 0.70) and undersampled training data (AUC = 0.74) yielded a better classification power than that on the training data (AUC = 0.65). Resampling could also improve the classification power of random forests and generalized boosted trees. To conclude, applying resampling methods in a class-imbalanced dataset improved the classification power of CART, random forests, and generalized boosted trees.
URI: http://hdl.handle.net/10397/35963
ISSN: 1661-7827 (print)
1660-4601 (eISSN)
DOI: 10.3390/ijerph110909776
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