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检索条件"主题词=em algorithm"
4566 条 记 录,以下是251-260 订阅
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Heterogeneous Multivariate Functional Time Series Modeling: A State Space Approach
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IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 2024年 第12期36卷 8421-8433页
作者: Liu, Peiyao Lin, Junpeng Zhang, Chen Tsinghua Univ Dept Ind Engn Beijing 100190 Peoples R China
Functional data have been gaining increasing popularity in the field of time series analysis. However, so far modeling heterogeneous multivariate functional time series remains a research gap. To fill it, this paper p... 详细信息
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Estimating Mean Viral Load Trajectory From Intermittent Longitudinal Data and Unknown Time Origins
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STATISTICS IN MEDICINE 2025年 第5期44卷 e70033页
作者: Woodbridge, Yonatan Mandel, Micha Goldberg, Yair Huppert, Amit Sheba Med Ctr Gertner Inst Epidemiol & Hlth Policy Res Ramat Gan Israel Holon Inst Technol Dept Comp Sci Holon Israel Hebrew Univ Jerusalem Dept Stat & Data Sci Jerusalem Israel Technion Israel Inst Technol Fac Ind Engn & Management Haifa Israel Tel Aviv Univ Fac Med & Hlth Sci Sch Publ Hlth Dept Epidemiol & Prevent Med Tel Aviv Israel
Viral load (VL) in the respiratory tract is the leading proxy for assessing infectiousness potential. Understanding the dynamics of disease-related VL within the host is of great importance, as it helps to determine d... 详细信息
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Generalized linear model based on latent factors and supervised components
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COMPUTATIONAL STATISTICS 2025年 第3期40卷 1475-1516页
作者: Gibaud, Julien Bry, Xavier Trottier, Catherine Univ Montpellier CNRS IMAG Montpellier France Univ Paul Valery Montpellier 3 AMIS F-34000 Montpellier France
In a context of component-based multivariate modeling we propose to model the residual dependence of the responses. Each response of a response vector is assumed to depend, through a Generalized Linear Model, on a set... 详细信息
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Insurance loss modeling with gradient tree-boosted mixture models
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INSURANCE MATHemATICS & ECONOMICS 2025年 121卷 45-62页
作者: Hou, Yanxi Li, Jiahong Gao, Guangyuan Fudan Univ Sch Data Sci Shanghai 200433 Peoples R China Peking Univ Sch Math Sci Beijing 100871 Peoples R China Renmin Univ China Ctr Appl Stat Sch Stat Beijing 100872 Peoples R China
In actuarial practice, finite mixture model is one widely applied statistical method to model the insurance loss. Although the Expectation-Maximization (em) algorithm usually plays an essential tool for the parameter ... 详细信息
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Semi-parametric Spatio-Temporal Hawkes Process for Modelling Road Accidents in Rome
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JOURNAL OF AGRICULTURAL BIOLOGICAL AND ENVIRONMENTAL STATISTICS 2025年 第1期30卷 8-38页
作者: Di Loro, Pierfrancesco Alaimo Mingione, Marco Fantozzi, Paolo Dipartimento Giurisprudenza Econ Polit & Lingue Mo LUMSA Rome Italy Univ Roma Tre Dipartimento Sci Polit Rome Italy
We propose a semi-parametric spatio-temporal Hawkes process with periodic components to model the occurrence of car accidents in a given spatio-temporal window. The overall intensity is split into the sum of a backgro... 详细信息
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On the time of corner kicks in soccer: an analysis of event history data
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COMPUTATIONAL STATISTICS 2025年 第4期40卷 2067-2083页
作者: Peng, K. Ken Hu, X. Joan Swartz, Tim B. Simon Fraser Univ Dept Stat & Actuarial Sci 8888 Univ Dr Burnaby BC V5A 1S6 Canada
To understand the patterns of times to corner kicks in soccer and how they are associated with a few important factors, we analyze the corner kick records from the 2019 regular season of the Chinese Super League. This... 详细信息
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Analysis of Informatively Interval-Censored Case-Cohort Studies with the Application to HIV Vaccine Trials
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COMMUNICATIONS IN MATHemATICS AND STATISTICS 2025年 第1期13卷 195-215页
作者: Du, Mingyue Zhou, Qingning Jilin Univ Sch Math Changchun 130012 Peoples R China Univ North Carolina Charlotte Dept Math & Stat Charlotte NC USA
Case-cohort studies are commonly used in various investigations, and many methods have been proposed for their analyses. However, most of the available methods are for right-censored data or assume that the censoring ... 详细信息
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Revisiting Dirichlet Mixture Model: unraveling deeper insights and practical applications
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STATISTICAL PAPERS 2025年 第1期66卷 1-38页
作者: Pal, Samyajoy Heumann, Christian Ludwig Maximilians Univ Munchen Dept Stat Ludwigstr 33 D-80539 Munich Bavaria Germany
This study revisits the Dirichlet Mixture Model (DMM), offering comprehensive insights into specific facets of parameter estimation. Estimating parameters of the DMM is challenging, with previous approaches focusing o... 详细信息
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Mixtures of multivariate Gaussians
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STOCHASTIC ANALYSIS AND APPLICATIONS 2024年 第4期42卷 737-752页
作者: van der Hoek, John Elliott, Robert J. Univ South Australia Adelaide Australia Univ Calgary Calgary AB Canada
This article discusses the approximation of probability densities by mixtures of Gaussian densities. The Kullback-Leibler divergence is used as a measure between densities, followed by applications of the em algorithm... 详细信息
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Likelihood inference for unified transformation cure model with interval censored data
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COMPUTATIONAL STATISTICS 2025年 第1期40卷 125-151页
作者: Treszoks, Jodi Pal, Suvra Univ Texas Arlington Dept Math 411 S Nedderman Dr Arlington TX 76019 USA Univ Texas Arlington Coll Sci Div Data Sci Arlington TX 76019 USA
In this paper, we extend the unified class of Box-Cox transformation (BCT) cure rate models to accommodate interval-censored data. The probability of cure is modeled using a general covariate structure, whereas the su... 详细信息
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