arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2302.07415stat.MLstat.AP
收藏

核两样本检验的变量选择

Variable Selection for Kernel Two-Sample Tests

Jie Wang, Santanu S. Dey, Yao Xie

AI总结:

针对两样本检验的变量选择问题,提出基于核最大均值差异(MMD)的新框架,通过最大化方差正则化MMD统计量选择最优变量子集,并推导了混合整数规划求解算法与检验功效收敛速率,在高维数据上表现优越。

摘要:

我们考虑两样本检验的变量选择问题,旨在选择最具信息量的变量以确定两组样本集合是否服从相同的分布。为此,我们提出了一种基于核最大均值差异(MMD)的新颖框架。该方法寻找一个具有预先指定大小的变量子集,以最大化方差正则化的核MMD统计量。我们重点关注三种常用的核类型:线性核、二次核和高斯核。从计算角度,我们推导了混合整数规划公式,并提出了具有性能保证的精确和近似算法来求解这些公式。从统计角度,我们在适当条件下推导了该框架的检验功效收敛速率。这些结果表明,三种核的样本量需求主要取决于所选变量的数量,而非数据维度。在合成和真实数据集上的实验结果证明,与其他变量选择框架相比,我们的方法具有优越的性能,特别是在高维环境中。

英文摘要:

We consider the variable selection problem for two-sample tests, aiming to select the most informative variables to determine whether two collections of samples follow the same distribution. To address this, we propose a novel framework based on the kernel maximum mean discrepancy (MMD). Our approach seeks a subset of variables with a pre-specified size that maximizes the variance-regularized kernel MMD statistic. We focus on three commonly used types of kernels: linear, quadratic, and Gaussian. From a computational perspective, we derive mixed-integer programming formulations and propose exact and approximation algorithms with performance guarantees to solve these formulations. From a statistical viewpoint, we derive the rate of testing power of our framework under appropriate conditions. These results show that the sample size requirements for the three kernels depend crucially on the number of selected variables, rather than the data dimension. Experimental results on synthetic and real datasets demonstrate the superior performance of our method, compared to other variable selection frameworks, particularly in high-dimensional settings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑