Robust clustering of multiply censored data via mixtures of t factor analyzers

Wan Lun Wang, Tsung I. Lin

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

Mixtures of t factor analyzers (MtFA) have been well recognized as a prominent tool in modeling and clustering multivariate data contaminated with heterogeneity and outliers. In certain practical situations, however, data are likely to be censored such that the standard methodology becomes computationally complicated or even infeasible. This paper presents an extended framework of MtFA that can accommodate censored data, referred to as MtFAC in short. For maximum likelihood estimation, we construct an alternating expectation conditional maximization algorithm in which the E-step relies on the first-two moments of truncated multivariate-t distributions and CM-steps offer tractable solutions of updated estimators. Asymptotic standard errors of mixing proportions and component mean vectors are derived by means of missing information principle, or the so-called Louis’ method. Several numerical experiments are conducted to examine the finite-sample properties of estimators and the ability of the proposed model to downweight the impact of censoring and outlying effects. Further, the efficacy and usefulness of the proposed method are also demonstrated by analyzing a real dataset with genuine censored observations.

原文English
頁(從 - 到)22-53
頁數32
期刊Test
31
發行號1
DOIs
出版狀態Published - 2022 3月

All Science Journal Classification (ASJC) codes

  • 統計與概率
  • 統計、概率和不確定性

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