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High-Dimensional Covariance Estimation when Tails are Heavy
Nov. 2, 2022, 5:39 p.m. | Jeffrey Näf
Towards Data Science - Medium towardsdatascience.com
R-NL: Robust Nonlinear Shrinkage
In this article, I discuss a new covariance estimation method from our recent paper “R-NL: Fast and Robust Covariance Estimation for Elliptical Distributions in High Dimensions’’ on arXiv. I introduce the problem we are solving, try to give some intuition on how we are solving it, and briefly present the simple code we developed. On the way, I touch upon some interesting concepts, like the (robust) “Tyler’s estimator”, which I feel are somewhat underused in …
covariance covariance-matrix data science high-dimensional-data statistics thoughts-and-theory
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