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Applied Computational Intelligence and Soft Computing
Volume 2016 (2016), Article ID 7658207, 12 pages
Research Article

Prediction of Defective Software Modules Using Class Imbalance Learning

Indian Institute of Information Technology, No. 5203, CC-3 Building, Allahabad, Uttar Pradesh 211012, India

Received 17 November 2015; Accepted 19 January 2016

Academic Editor: Zhang Yi

Copyright © 2016 Divya Tomar and Sonali Agarwal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Software defect predictors are useful to maintain the high quality of software products effectively. The early prediction of defective software modules can help the software developers to allocate the available resources to deliver high quality software products. The objective of software defect prediction system is to find as many defective software modules as possible without affecting the overall performance. The learning process of a software defect predictor is difficult due to the imbalanced distribution of software modules between defective and nondefective classes. Misclassification cost of defective software modules generally incurs much higher cost than the misclassification of nondefective one. Therefore, on considering the misclassification cost issue, we have developed a software defect prediction system using Weighted Least Squares Twin Support Vector Machine (WLSTSVM). This system assigns higher misclassification cost to the data samples of defective classes and lower cost to the data samples of nondefective classes. The experiments on eight software defect prediction datasets have proved the validity of the proposed defect prediction system. The significance of the results has been tested via statistical analysis performed by using nonparametric Wilcoxon signed rank test.