Penalized proportion estimation for non parametric mixture of regressions

Abstract

In this article, we propose a penalized local log-likelihood method to locally select the number of components in non parametric finite mixture of regression models via proportion shrinkage method. Mean functions and variance functions are estimated simultaneously. We show that the number of components can be estimated consistently, and further establish asymptotic normality of functional estimates. We use a modified EM algorithm to estimate the unknown functions. Simulations are conducted to demonstrate the performance of the proposed method. We illustrate our method via an empirical analysis of the housing price index data of United States.     

论判定补贴利益的私人投资基准： 法解释学与法经济学的视角

在反补贴案件中,私人投资基准是判定政府投资是否带给企业以补贴利益的标准。在具体选择私人投资基准时,不宜设置股权比例的限制,也不可选择囿于沉没成本效应的内部投资者价格,更不应采用容易异化为贸易保护的结构价格。若无私人投资价格,可转而审查政府投资是否基于商业动机,但投资动机的举证责任由被调查方承担。符合关联性、中立性、逻辑性、专业性四项要求,由会计师事务所等专业机构出具的报告,是商业动机的首选证据。     

不同震级作用下的设备 结构动力相互作用体系地震反应分析

为研究是否考虑设备 结构动力相互作用在不同地震阶段的差别,对建筑结构中常见的设备 结构相互作用体系进行了小震、中震和大震阶段的地震时程反应分析。分析了不同震级作用下考虑相互作用后给结构与设备的地震反应带来的变化。结果表明：考虑设备 结构动力相互作用与不考虑相互作用相比,结构的地震反应有较明显的区别,设备的地震反应有很大的区别,处于完全失真的状态。大震阶段由于设备和结构均进入了弹塑性阶段,刚度等主要参数发生了变化,导致动力相互作用的影响降低。虽然设备质量占结构总地震质量的比例很小,但仍会对结构位移与内力造成较大的影响。     

Robust Smoothed Rank Estimation Methods for Accelerated Failure Time Model Allowing Clusters

Smoothed Gehan rank estimation methods are widely used in accelerated failure time (AFT) models with/without clusters. However, most methods are sensitive to outliers in the covariates. In order to solve this problem, we propose robust approaches based on the smoothed Gehan rank estimation methods for the AFT model, allowing for clusters by employing two different weight functions. Simulation studies show that the proposed methods outperform existing smoothed rank estimation methods regarding their biases and standard deviations when there are outliers in the covariates. The proposed methods are also applied to a real dataset from the “Major cardiovascular interventions” study.     

“智慧教育”背景下应用型高等院校活力课堂建设路径——基于工商管理类专业的考察

随着智慧课堂、智慧教室和智慧校园等智慧教育成果的运用,推进智慧教学,打造活力课堂,已成为提升应用型大学教育教学质量的重要手段.当前应用型大学活力课堂建设仍然存在缺乏系统性的融合方法、多维度的体验情景、多渠道的协同实战和高共享的智慧平台四大障碍因素.因此,应打破企业只是“接盘侠”、学生只是“知识人”、创业教育只是“独行者...     

2010年广州亚运会旅游的战略地位与应对策略

广州亚运会具有体育与事件旅游双重属性。旅游业是深度利用亚运会的主力资源,是提升城市竞争力的动力产业,在亚运会战略实施中占有重要地位,因此应在亚运赛前、赛中与赛后采取相应对策。政府的高度重视与战略规划是实施关键。     

孙中山、毛泽东、邓小平对中国社会主义所有制结构的探索

本文在学术界首次比较全面地研究了孙中山、毛泽东、邓小平对中国社会主义生产资料所有制结构的探索,指出了他们三者的异同,这不仅加深了学术界对他们社会主义思想的研究,而且有助于揭示经济落后中国社会经济发展的客观规律,对我们今天走自己的路、建设具有中国特色的社会主义亦有裨益.     

Functional and emotional traits of corporate social media message strategies: Behavioral insights from S&P 500 Facebook data

Drawing from literature regarding public engagement, the Elaboration Likelihood Model (ELM), computer-mediated communication research, and emotion psychology, this study examines the effects of companies’ social media communication strategies on public engagement behaviors as indexed by post likes, shares, and comments. Specifically, it investigates how corporate Facebook posts’ functional traits (functional interactivity and vividness) and emotional traits (emotion presence, valence, and strength) impact public engagement online. Through data mining and computer-assisted sentiment analysis of 33,379 posts from 106 Standard & Poor 500 companies’ Facebook accounts, this study finds a negative effect of functional interactivity but a positive effect of vividness on engagement. It also shows that emotional traits overall yield stronger public engagement outcomes. Two-way interactions between emotional and functional features are also detected. Theoretical and practical implications are discussed.     

The quest for legitimacy and the communication of strategic cross-sectoral partnership on Facebook: A big data study

Nowadays, many wicked problems such as environmental issues require organizations from multiple sectors to form cross-sectoral alliances. Cross-sectoral alliance networks can transfer resources and signal affiliations and value alignment between strategic partners. The communication of cross-sectoral alliances is a form of CSR communication that serves organizations’ strategic goals and objectives. Drawing on the literature on digital CSR communication and legitimacy theory, this article examines which legitimacy needs shape the formation of cross-sectoral ties on Facebook in addressing environmental and sustainable development issues in the United States. Combining data-mining, text-mining, social network analysis, and exponential graph modeling, this research investigates the structure of a network among 3071 organizations across multiple sectors. Findings show that organizations’ cross-sectoral tie formation is mainly driven by social legitimacy and alliance legitimacy needs.     

Threatened plant species in the river ports of Central Europe: a potential for nature conservation

Industrialized areas represent a special group of urbanized areas, but sufficient attention has not been given to them concerning plant species richness and its importance for biodiversity conservation. These sites are considered the main drivers of biological invasions and biotic homogenization on a global scale, but the question of how and to what degree they contribute to biodiversity has yet to be raised. Data for 62 river ports (16 German, 26 Czech, 7 Hungarian, 4 Slovak, and 9 Austrian) on two important Central European waterways (the Elbe-Vltava and Danube waterways) were gathered for 40 years. In total, 1 240 plant species were found. Of these, 371 were classified as threatened and protected, nearly one third of the total number of species found in all of the studied Elbe, Vltava, and Danube ports. Significant differences in the proportion of threatened species in ports and cities were not found. More threatened species were found in the Danube ports than in the other ports, but their numbers fluctuated depending on the size of the port and the region (country). The results showed that the ports must be regarded as special types of species-rich industrial areas; thus, they should not be considered to be only sources of spreading invasive alien species. When planning port development, uniformity and vegetation management that is too intensive should be avoided. Extensively managed open areas and habitat diversity should be maintained.