Based on the notion of the complex L_(p)centroid body,we establish Brunn-Minkowski type inequalities and monotonicity inequalities for complex L_(p)centroid bodies in this article.Moreover,we obtain the affirmative fo...Based on the notion of the complex L_(p)centroid body,we establish Brunn-Minkowski type inequalities and monotonicity inequalities for complex L_(p)centroid bodies in this article.Moreover,we obtain the affirmative form of Shephard type problem for the complex L_(p)centroid bodies and its negative form.展开更多
Truncated data are commonly observed in economics,epidemiology,and other fields.The analysis of truncated data is challenging because the observed data are usually a biased sample of the target population due to trunc...Truncated data are commonly observed in economics,epidemiology,and other fields.The analysis of truncated data is challenging because the observed data are usually a biased sample of the target population due to truncation.Existing methods of handling truncated data largely depend on conditional likelihood which is the joint distribution of the data given that they are observed,and may be unreliable or have potential efficiency loss.In this paper,the authors develop a maximum full likelihood inference method for truncated data under a parametric model for the conditional distribution of the target variable given covatiates.The distribution of the truncation variable is left unspecified.The authors establish the asymptotic normalities of the maximum likelihood estimators(MLE)for various parameters,and the likelihood ratio statistics have central chisquare limiting distributions.As a by-product,the proposed method provides a natural MLE for the total number of the observed and unobserved data,which may shed light on the extent of truncation bias.A score test is provided to check the correctness of the assumed parametric model.Our simulation results indicate that the proposed estimation method generally produces more reliable point and interval estimates.For illustration,the authors apply the proposed approaches to analyze a breast cancer data in the Rotterdam Tumor Bank.展开更多
本文涉及的"党媒"是指主流媒体,所谓党媒话语权或党媒话语建设,就是指中国主流媒体的话语建设。讨论话语或话语建设问题,首先要搞清楚我们面临的国际环境,尤其是国际舆论环境,发生了怎样的变化,这样讨论才会更具有针对性。美...本文涉及的"党媒"是指主流媒体,所谓党媒话语权或党媒话语建设,就是指中国主流媒体的话语建设。讨论话语或话语建设问题,首先要搞清楚我们面临的国际环境,尤其是国际舆论环境,发生了怎样的变化,这样讨论才会更具有针对性。美国皮尤研究中心(Pew Research Center)近年来多次发布有关中国形象的调查报告。报告显示,2018年以来,特别是2019-2020年,西方国家对中国的认知、评价水平是大幅下降的,这是令人感到遗憾的.展开更多
基金Supported by the National Natural Science Foundation of China(11901346)
文摘Based on the notion of the complex L_(p)centroid body,we establish Brunn-Minkowski type inequalities and monotonicity inequalities for complex L_(p)centroid bodies in this article.Moreover,we obtain the affirmative form of Shephard type problem for the complex L_(p)centroid bodies and its negative form.
基金supported by the National Natural Science Foundation of China under Grant Nos.72331005,71931004,12171157,and 32030063the 111 Project under Grant No.B14019。
文摘Truncated data are commonly observed in economics,epidemiology,and other fields.The analysis of truncated data is challenging because the observed data are usually a biased sample of the target population due to truncation.Existing methods of handling truncated data largely depend on conditional likelihood which is the joint distribution of the data given that they are observed,and may be unreliable or have potential efficiency loss.In this paper,the authors develop a maximum full likelihood inference method for truncated data under a parametric model for the conditional distribution of the target variable given covatiates.The distribution of the truncation variable is left unspecified.The authors establish the asymptotic normalities of the maximum likelihood estimators(MLE)for various parameters,and the likelihood ratio statistics have central chisquare limiting distributions.As a by-product,the proposed method provides a natural MLE for the total number of the observed and unobserved data,which may shed light on the extent of truncation bias.A score test is provided to check the correctness of the assumed parametric model.Our simulation results indicate that the proposed estimation method generally produces more reliable point and interval estimates.For illustration,the authors apply the proposed approaches to analyze a breast cancer data in the Rotterdam Tumor Bank.
文摘本文涉及的"党媒"是指主流媒体,所谓党媒话语权或党媒话语建设,就是指中国主流媒体的话语建设。讨论话语或话语建设问题,首先要搞清楚我们面临的国际环境,尤其是国际舆论环境,发生了怎样的变化,这样讨论才会更具有针对性。美国皮尤研究中心(Pew Research Center)近年来多次发布有关中国形象的调查报告。报告显示,2018年以来,特别是2019-2020年,西方国家对中国的认知、评价水平是大幅下降的,这是令人感到遗憾的.
