Minority Split and Gain Ratio for a Class Imbalance
A decision tree is one of most popular classifiers that classifies a balanced data set effectively. For an imbalanced data set, a standard decision tree tends to misclassify instances of a class having tiny number of samples. In this paper, we modify the decision tree induction algorithm by performing a ternary split on continuous-valued attributes focusing on distribution of minority class instances. The algorithm uses the minority variance to rank candidates of the high gain ratio, then it chooses the candidate with the minimum minority entropy. From our experiments with data sets from UCI and Statlog repository, this method achieves the better performance comparing with C4.5 using only gain ratio for imbalanced data sets.
Gain Ratio Minority split Decision tree Class imbalance Classification
Kesinee Boonchuay Krung Sinapiromsaran Chidchanok Lursinsap
Department of Mathematics, Faculty of Science Chulalongkom University Bangkok, Thailand
国际会议
上海
英文
2114-2118
2011-07-26（万方平台首次上网日期，不代表论文的发表时间）