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AStA Advances in Statistical Analysis - The density function is a fundamental concept in data analysis. When a population consists of heterogeneous subjects, it is often of great interest to... 相似文献
893.
Chaobing He 《统计学通讯:理论与方法》2017,46(12):5827-5839
This paper considers the multiple change-point estimation for exponential distribution with truncated and censored data by Gibbs sampling. After all the missing data of interest is filled in by some sampling methods such as rejection sampling method, the complete-data likelihood function is obtained. The full conditional distributions of all parameters are discussed. The means of Gibbs samples are taken as Bayesian estimations of the parameters. The implementation steps of Gibbs sampling are introduced in detail. Finally random simulation test is developed, and the results show that Bayesian estimations are fairly accurate. 相似文献
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Wang Wenjie Zhang Bo Zhou Wei Lv Hailiang Xiao Lu Wang Hongyuan Du Hongju He Xingyuan 《Urban Ecosystems》2019,22(2):367-384
Urban Ecosystems - Rapid urbanization and climate change require stronger microclimatic regulation by urban trees, and maximizing their cooling, humidifying, and shading functions requires an exact... 相似文献
897.
资本主义:从社会契约论到社会资本论--论社会资本概念在政治领域拓展的意义及其局限 总被引:5,自引:0,他引:5
社会资本概念的流行是与其在政治领域的拓展分不开的,这一拓展既反映了它在理论上与社会契约论的内在逻辑关系,也反映了资本主义在实践中的自我调整过程。社会资本概念本身的矛盾性质,深刻地反映了资本主义发展的内在困境;这一概念在应用于第三世界国家时存在着文化决定论的倾向。 相似文献
898.
改革开放以来,凉山彝族婚嫁彩礼持续走高,特别近10年来,婚嫁彩礼已经变异为“高额彩礼”。课题组自2018年至2022年,以凉山彝族“高额彩礼”为研究对象,探究“高额彩礼”的性质、形成的原因和带来的社会问题;我们认为 “高额彩礼”阻碍凉山社会经济与精神文明的发展,不利于社会和谐稳定,凉山急需进行一场彻底的移风易俗洗礼,使彩礼不再“高额”,让彝族青年走出“婚嫁漩涡”,形成崇尚文明新风、抵制陈规陋习的社会风气,助力脱贫致富奔小康。 相似文献
899.
In modern scientific research, multiblock missing data emerges with synthesizing information across multiple studies. However, existing imputation methods for handling block-wise missing data either focus on the single-block missing pattern or heavily rely on the model structure. In this study, we propose a single regression-based imputation algorithm for multiblock missing data. First, we conduct a sparse precision matrix estimation based on the structure of block-wise missing data. Second, we impute the missing blocks with their means conditional on the observed blocks. Theoretical results about variable selection and estimation consistency are established in the context of a generalized linear model. Moreover, simulation studies show that compared with existing methods, the proposed imputation procedure is robust to various missing mechanisms because of the good properties of regression imputation. An application to Alzheimer's Disease Neuroimaging Initiative data also confirms the superiority of our proposed method. 相似文献
900.
Yun Wang Wenda Tu Yoonhee Kim Susie Sinks Jiwei He Alex Cambon Roberto Crackel Kiya Hamilton Anna Kettermann Jennifer Clark 《Pharmaceutical statistics》2023,22(4):650-670
The International Council for Harmonization (ICH) E9(R1) addendum recommends choosing an appropriate estimand based on the study objectives in advance of trial design. One defining attribute of an estimand is the intercurrent event, specifically what is considered an intercurrent event and how it should be handled. The primary objective of a clinical study is usually to assess a product's effectiveness and safety based on the planned treatment regimen instead of the actual treatment received. The estimand using the treatment policy strategy, which collects and analyzes data regardless of the occurrence of intercurrent events, is usually utilized. In this article, we explain how missing data can be handled using the treatment policy strategy from the authors' viewpoint in connection with antihyperglycemic product development programs. The article discusses five statistical methods to impute missing data occurring after intercurrent events. All five methods are applied within the framework of the treatment policy strategy. The article compares the five methods via Markov Chain Monte Carlo simulations and showcases how three of these five methods have been applied to estimate the treatment effects published in the labels for three antihyperglycemic agents currently on the market. 相似文献