High-Dimensional Sliced Inverse Kendall’s Tau Estimation for Heavy-Tailed Data
面向重尾数据的高维切片逆 Kendall 秩相关估计AI 解读 ↓
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面向重尾数据的高维切片逆 Kendall 秩相关估计AI 解读 ↓
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Sufficient dimension reduction is an important branch of statistical learning, which performs an optimal projection of covariates under a supervised learning framework. Most of the existing sufficient dimension reduction algorithms require strict restrictions on the distribution of models, making them sensitive to heavy-tailed predictors and outliers. In this article, we propose a novel method called Sliced Inverse Kendall’s tau Estimation (SIKE) designed for analyzing heavy-tailed, elliptically distributed and high-dimensional data that find wide application, especially in finance and economics. Compared with other existing methods, SIKE does not require computing median or conditional median, thus imposes milder conditions on the method and increases the precision of estimation. Furthermore, a remedial algorithm is introduced in discouraging situation, which enhances the general adaptability of our method. We investigate the theoretical properties of SIKE as the dimension p diverges with sample size n. Extensive simulation studies show that SIKE performs significantly well for various scenarios. Analyses of asset pricing data and housing data also demonstrate the effectiveness of our proposed method.