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Improving estimation for beta regression models via EM-algorithm and related diagnostic tools

机译:通过EM算法和相关的诊断工具来改进Beta回归模型的估计

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摘要

In this paper we propose an alternative procedure for estimating the parameters of the beta regression model. This alternative estimation procedure is based on the EM-algorithm. For this, we took advantage of the stochastic representation of the beta random variable through ratio of independent gamma random variables. We present a complete approach based on the EM-algorithm. More specifically, this approach includes point and interval estimations and diagnostic tools for detecting outlying observations. As it will be illustrated in this paper, the EM-algorithm approach provides a better estimation of the precision parameter when compared to the direct maximum likelihood (ML) approach. We present the results of Monte Carlo simulations to compare EM-algorithm and direct ML. Finally, two empirical examples illustrate the full EM-algorithm approach for the beta regression model. This paper contains a Supplementary Material.
机译:在本文中,我们提出了另一种估计β回归模型参数的方法。此替代估计过程基于EM算法。为此,我们通过独立的伽玛随机变量的比率利用了β随机变量的随机表示。我们提出一种基于EM算法的完整方法。更具体地说,此方法包括点和间隔估计以及用于检测异常观测值的诊断工具。正如本文将要说明的那样,与直接最大似然(ML)方法相比,EM算法方法可以更好地估计精度参数。我们介绍了蒙特卡罗模拟的结果,以比较EM算法和直接ML。最后,两个经验示例说明了Beta回归模型的完整EM算法。本文包含补充材料。

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