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Model-based clustering via mixtures of unrestricted skew normal factor analyzers with complete and incomplete data

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  • Wan-Lun Wang

    (National Cheng Kung University)

  • Tsung-I Lin

    (National Chung Hsing University
    China Medical University)

Abstract

Mixtures of factor analyzers (MFA) based on the restricted skew normal distribution (rMSN) have emerged as a flexible tool to handle asymmetrical high-dimensional data with heterogeneity. However, the rMSN distribution is oft-criticized a lack of sufficient ability to accommodate potential skewness arisen from more than one feature space. This paper presents an alternative extension of MFA by assuming the unrestricted skew normal (uMSN) distribution for the component factors. In particular, the proposed mixtures of unrestricted skew normal factor analyzers (MuSNFA) can simultaneously capture multiple directions of skewness and deal with the occurrence of missing values or nonresponses. Under the missing at random (MAR) mechanism, we develop a computationally feasible expectation conditional maximization (ECM) algorithm for computing the maximum likelihood estimates of model parameters. Practical aspects related to model-based clustering, prediction of factor scores and imputation of missing values are also discussed. The utility of the proposed methodology is illustrated with the analysis of simulated and real datasets.

Suggested Citation

  • Wan-Lun Wang & Tsung-I Lin, 2023. "Model-based clustering via mixtures of unrestricted skew normal factor analyzers with complete and incomplete data," Statistical Methods & Applications, Springer;Società Italiana di Statistica, vol. 32(3), pages 787-817, September.
    • Handle: RePEc:spr:stmapp:v:32:y:2023:i:3:d:10.1007_s10260-022-00674-x
    DOI: 10.1007/s10260-022-00674-x
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