Event
Testing elliptical and independent component models in high dimensions
Miles Lopes
Associate Professor
UC Davis
Date: 25 February 2026, Wednesday
Time: 3 pm, Singapore
Venue: S16-06-118, Seminar Room
Due to the broad applications of elliptical models, there is a long line of research on goodness-of-fit tests for empirically validating them. However, the existing literature on this topic is generally confined to low- dimensional settings, and to the best of our knowledge, there are no established goodness-of-fit tests for elliptical models that are supported by theoretical guarantees in high dimensions. In this work, we propose a new goodness-of-fit test for this problem, and our main result shows that the test is asymptotically valid when the dimension and sample size diverge proportionally. Remarkably, it also turns out that the asymptotic validity of the test requires no assumptions on the population covariance matrix. With regard to numerical performance, we confirm that the empirical level of the test is close to the nominal level across a range of conditions, and that the test is able to reliably detect non-elliptical distributions. Lastly, we will discuss some more recent work extending these ideas to a goodness-of-fit test for independent component models in high dimensions. (A subset of this work will appear in JASA: https://doi.org/10.1080/01621459.2025.2518617. Joint work with Siyao Wang and Mingshuo Liu.)