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- W2955361554 abstract "Multivariate longitudinal data arisen in medical studies often exhibit complex features such as censored responses, intermittent missing values, and atypical or outlying observations. The multivariate- t linear mixed model (MtLMM) has been recognized as a powerful tool for robust modeling of multivariate longitudinal data in the presence of potential outliers or fat-tailed noises. This paper presents a generalization of MtLMM, called the MtLMM-CM, to properly adjust for censorship due to detection limits of the assay and missingness embodied within multiple outcome variables recorded at irregular occasions. An expectation conditional maximization either (ECME) algorithm is developed to compute parameter estimates using the maximum likelihood (ML) approach. The asymptotic standard errors of the ML estimators of fixed effects are obtained by inverting the empirical information matrix according to Louis' method. The techniques for the estimation of random effects and imputation of missing responses are also investigated. The proposed methodology is illustrated on two real-world examples from HIV-AIDS studies and a simulation study under a variety of scenarios." @default.
- W2955361554 created "2019-07-12" @default.
- W2955361554 creator A5001115779 @default.
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- W2955361554 date "2019-06-26" @default.
- W2955361554 modified "2023-10-08" @default.
- W2955361554 title "Multivariate-<i>t</i> linear mixed models with censored responses, intermittent missing values and heavy tails" @default.
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- W2955361554 doi "https://doi.org/10.1177/0962280219857103" @default.
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