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 | Issue Date: | 2014 | Source: | International journal of environmental research and public health, Sept. 2014, v. 11, no. 9, p. 9776-9789 | 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. | Keywords: | Automated classifier Data mining Decision tree Oversampling Predictive power Rare events |
Publisher: | Molecular Diversity Preservation International (MDPI) | Journal: | International journal of environmental research and public health | ISSN: | 1661-7827 | EISSN: | 1660-4601 | DOI: | 10.3390/ijerph110909776 | Rights: | © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). The following publication Lee, P. H. (2014). Resampling methods improve the predictive power of modeling in class-imbalanced datasets. International Journal of Environmental Research and Public Health, 11(9), (Suppl. ), 9776-9789 is available athttps://dx.doi.org/10.3390/ijerph110909776 |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Lee_Resampling_Class-imbalanced_Datasets.pdf | 574.77 kB | Adobe PDF | View/Open |
Page views
78
Last Week
1
1
Last month
Citations as of Mar 24, 2024
Downloads
38
Citations as of Mar 24, 2024
SCOPUSTM
Citations
44
Last Week
0
0
Last month
Citations as of Mar 28, 2024
WEB OF SCIENCETM
Citations
40
Last Week
0
0
Last month
Citations as of Mar 28, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.