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arXiv 2005.08267stat.ME
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基于模型的变聚类方向的纵向聚类

Model-Based Longitudinal Clustering with Varying Cluster Assignments

Daniel K. Sewell, Yuguo Chen, William Bernhard, Tracy Sulkin

摘要:

对纵向数据执行聚类通常是令人感兴趣的,然而很难制定一个直观的模型,用于估计在计算上是可行的。我们提出了一个基于模型的聚类方法,随着时间的推移观察到的对象进行聚类。该模型可以看作是正态混合聚类模型对纵向数据的推广。虽然现有的模型只考虑集群效应,我们建议建模的分布,每个对象的观察值的集群效应和个体效应的混合,因此也给出了一个对象的行为有多少是由它所属的集群确定的估计。此外,重要的是要检测解释变量如何影响聚类。我们的方法的一个优点是,它可以处理任何类型的多个解释变量,通过线性建模的集群转移概率。我们使用几个递归关系来实现广义期望最大化算法,以大大降低计算成本。我们的估计方法的准确性说明在模拟研究中,美国国会的数据进行了分析。

英文摘要:

It is often of interest to perform clustering on longitudinal data, yet it is difficult to formulate an intuitive model for which estimation is computationally feasible. We propose a model-based clustering method for clustering objects that are observed over time. The proposed model can be viewed as an extension of the normal mixture model for clustering to longitudinal data. While existing models only account for clustering effects, we propose modeling the distribution of the observed values of each object as a blending of a cluster effect and an individual effect, hence also giving an estimate of how much the behavior of an object is determined by the cluster to which it belongs. Further, it is important to detect how explanatory variables affect the clustering. An advantage of our method is that it can handle multiple explanatory variables of any type through a linear modeling of the cluster transition probabilities. We implement the generalized EM algorithm using several recursive relationships to greatly decrease the computational cost. The accuracy of our estimation method is illustrated in a simulation study, and U.S. Congressional data is analyzed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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