arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.6463stat.MEstat.APstat.CO
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基于加权因子分析器的聚类和分类

Clustering and Classification via Cluster-Weighted Factor Analyzers

Sanjeena Subedi, Antonio Punzo, Salvatore Ingrassia, Paul D. McNicholas

摘要:

在基于模型的聚类和分类中,当感兴趣的随机向量构成响应变量Y和解释变量X的集合p时,聚类加权模型构成方便的方法。然而,当p高时,其适用性可能受到限制。为了克服这个问题,本文假设一个潜在的因素结构的X在每个混合成分。这导致了聚类加权因子分析(CWFA)模型。通过对Y的方差和X的协方差阵施加约束,引入了一种新的16个CWFA模型族用于基于模型的聚类和分类。交替的期望条件最大化算法,所有的模型在家庭中的参数的极大似然估计,描述了初始化算法,提出了一个5步的分层过程,它使用的嵌套结构的家庭中的模型,从而保证自然的排名之间的16个可能性。人工和实际数据表明,这些模型具有很好的聚类和分类性能,算法能够很好地恢复参数。

英文摘要:

In model-based clustering and classification, the cluster-weighted model constitutes a convenient approach when the random vector of interest constitutes a response variable Y and a set p of explanatory variables X. However, its applicability may be limited when p is high. To overcome this problem, this paper assumes a latent factor structure for X in each mixture component. This leads to the cluster-weighted factor analyzers (CWFA) model. By imposing constraints on the variance of Y and the covariance matrix of X, a novel family of sixteen CWFA models is introduced for model-based clustering and classification. The alternating expectation-conditional maximization algorithm, for maximum likelihood estimation of the parameters of all the models in the family, is described; to initialize the algorithm, a 5-step hierarchical procedure is proposed, which uses the nested structures of the models within the family and thus guarantees the natural ranking among the sixteen likelihoods. Artificial and real data show that these models have very good clustering and classification performance and that the algorithm is able to recover the parameters very well.

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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