An EM Algorithm Fitting First-Order Conditional Autoregressive Models to Longitudinal Data
用 EM 算法拟合纵向数据的一阶条件自回归模型AI 解读 ↓
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An EM algorithm fits a state-space formulation of the longitudinal regression model in which a continuous response depends on the lagged response and both time-dependent and time-independent covariates. The baseline response depends only on covariates. The model handles both missing data and Gaussian measurement error on both response and continuous covariates. The E step uses the Kalman filter and associated filtering algorithms to update the unknown true response and predictor series for the observed data. The M step uses standard closed-form Gaussian results. Standard errors come from the supplemented EM (SEM) algorithm. The model accurately fits 6 years of pulmonary function measurements on 158 children with many missing observations.