Tian-Ming Zhu

High-Dimensional Two-Sample Covariance Testing with Null-Preserving Transformations

Testing equality of two high-dimensional covariance matrices is challenging when many entries differ only slightly. Dependence among sample covariance entries can also affect the finite-sample size and power of tests that aggregate their differences. We propose a studentized $\ell_2$-type statistic that averages square...