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stat.ME2026
Missingness-Adaptive Factor Identification in High-Dimensional Data
Ping Zeng, Yicheng Zeng, Lixing Zhu
Determining the number of factors in high-dimensional factor models remains a fundamental challenge, particularly when data are incomplete. This paper introduces the concept of ide…
stat.ME2019
Order Determination for Spiked Models
Yicheng Zeng, Lixing Zhu
Motivated by dimension reduction in regression analysis and signal detection, we investigate the order determination for large dimension matrices including spiked models of which t…