Graph-based multisample comparison with application to feature selection for multi-category responses
基于图的多样本比较及多类别响应的特征选择AI 解读 ↓
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This article proposes a graph-based maximum pairwise difference (MPD) test to compare K-sample distributions. This test can be utilized to identify the most informative variables contributing to the heterogeneity of multiple multivariate distributions. To construct the test, we first pool observations from multiple samples to create a similarity graph based on the distances between any two observations. For each observation, we next evaluate its connection probability to each sample. Then, we doubly maximize the squared differences of these connection probabilities via the within and between samples. Accordingly, the MPD test is a max-of-squares test and can effectively detect sparse alternatives. In addition, we show the asymptotic null distribution of the test statistic and establish its consistency under alternatives. To illustrate the finite sample performance of the proposed test, we conduct extensive simulation studies. The results indicate that the MPD test outperforms some commonly used multisample tests. Finally, we employ it to select relevant features related to corporate credit ratings.