3 papers
stat.ML2026
CART Random Forests as Sequential Allocation over Random Opportunity Sets: A Stochastic-Control Theory of Ensemble Risk
Tianxing Mei, Yingying Fan, Mingming Leng +1
CART random forests are among the most widely used modern predictive methods, with well-documented empirical success. Yet, at the mechanistic level, the algorithm is often treated…
math.ST2026
Many-sample tests for the dimensionality hypothesis for large covariance matrices among groups
Tianxing Mei, Chen Wang, Jianfeng Yao
In this paper, we consider procedures for testing hypotheses on the dimension of the linear span generated by a growing number of covariance matrices from independent $…
math.ST2024
Many-sample tests for the equality and the proportionality hypotheses between large covariance matrices
Tianxing Mei, Chen Wang, Jianfeng Yao
This paper proposes procedures for testing the equality hypothesis and the proportionality hypothesis involving a large number of covariance matrices of dimension .…