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Identifiability of extended latent class models with individual covariates

机译:具有单个协变量的扩展潜在类模型的可识别性

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摘要

Identifiability for a very flexible family of latent class models introduced recently is examined. These models allow for a conditional association between selected pairs of response variables conditionally on the latent and are based on logistic regression models both for the latent weights and for the conditional distributions of the response variables in terms of subject specific covariates. Generalized logits (global or continuation, which are relevant with ordered categorical responses and involve comparisons of cumulated probabilities) may be used as an alternative to the usual logits of type local which are log-linear. A compact matrix formulation for the Jacobian of the parametrization and a simple algorithm for checking local identifiability numerically is described. A few examples involving causal inference are examined.
机译:最近介绍了一个非常灵活的潜在类模型家族的可识别性。这些模型允许在条件上潜在的条件下选择的响应变量对之间的条件关联,并且基于潜在权重和响应变量在主题特定协变量方面的条件分布的逻辑回归模型。通用logit(全局或连续,与有序的分类响应相关,并且涉及累积概率的比较)可以用作对数线性的local类型的常用logit的替代方法。描述了一种用于参数化雅可比行列式的紧凑矩阵公式,以及一种用于通过数值检查局部可识别性的简单算法。研究了一些因果推论的例子。

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