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arXiv 2304.00537stat.MEstat.ML
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用于多元零膨胀连续数据的基于 Copula 的密度估计模型

Copula-Based Density Estimation Models for Multivariate Zero-Inflated Continuous Data

Keita Hamamoto

AI总结:

针对多元零膨胀连续数据的离散—连续混合结构及并列数据问题,提出两种基于 copula 的密度估计模型和新型 rectified Gaussian copula,并通过高效参数估计与似然计算验证其优于传统方法。

摘要:

零膨胀连续数据普遍出现在许多领域中,其中可观察到大量恰好为零值的数据,而其他数据则呈连续分布。由于其分布中离散性与连续性的混合结构,统计分析颇具挑战,尤其是在多元情形下。本文提出了两种基于 copula 的密度估计模型,能够处理零膨胀连续变量之间的多元相关性。为克服零膨胀数据中因数据并列(tied-data)问题导致 copula 使用困难,我们提出了一种新型 copula,即 rectified Gaussian copula(修正高斯 copula),并给出了用于参数估计和似然计算的高效方法。数值实验证明,与传统密度估计方法相比,我们所提方法具有优越性。

英文摘要:

Zero-inflated continuous data ubiquitously appear in many fields, in which lots of exactly zero-valued data are observed while others distribute continuously. Due to the mixed structure of discreteness and continuity in its distribution, statistical analysis is challenging especially for multivariate case. In this paper, we propose two copula-based density estimation models that can cope with multivariate correlation among zero-inflated continuous variables. In order to overcome the difficulty in the use of copulas due to the tied-data problem in zero-inflated data, we propose a new type of copula, rectified Gaussian copula, and present efficient methods for parameter estimation and likelihood computation. Numerical experiments demonstrates the superiority of our proposals compared to conventional density estimation methods.

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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