A Two-Part Random-Effects Model for Semicontinuous Longitudinal Data
半连续纵向数据的两部分随机效应模型AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确将两部分回归扩展到纵向重复观测,并在两阶段引入随机系数。
半连续纵向数据的两部分随机效应模型AI 解读 ↓
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A semicontinuous variable has a portion of responses equal to a single value (typically 0) and a continuous, often skewed, distribution among the remaining values. In cross-sectional analyses, variables of this type may be described by a pair of regression models; for example, a logistic model for the probability of nonzero response and a conditional linear model for the mean response given that it is nonzero. We extend this two-part regression approach to longitudinal settings by introducing random coefficients into both the logistic and the linear stages. Fitting a two-part random-effects model poses computational challenges similar to those found with generalized linear mixed models. We obtain maximum likelihood estimates for the fixed coefficients and variance components by an approximate Fisher scoring procedure based on high-order Laplace approximations. To illustrate, we apply the technique to data from the Adolescent Alcohol Prevention Trial, examining reported recent alcohol use for students in grades 7–11 and its relationships to parental monitoring and rebelliousness.