Connecting young adults to democracy via government social network sites

Young adults’ increasing disconnection with public affairs and heavy reliance on social media for political communication suggest a strategic use of social network sites (SNS) by the government to foster relationships with young citizens and to improve their citizenship. However, scholars and practitioners have not reached consensus about the exact influence of individuals’ experience with government SNS. Focusing on young eligible voters, this study proposes and tests a conceptual model that measures the perceptual, relational, and behavioral outcomes of public engagement with government agencies on SNS. Specifically, the findings revealed a positive influence of government SNS engagement on perceived government transparency, perceived political efficacy, and public participation but to varying degrees depending on the government level (e.g., federal, state, and local). This study suggests that there is limited influence of public engagement on the perceived government-citizen relationship quality through SNS. This empirical research demonstrates how a contextualized investigation of public engagement and relationship management provides insights into the role that SNS can play in connecting young adults to democracy.     

What does self-esteem have to do with behavioral health among low-income youth in Chicago?

Many studies have examined risk factors associated with poorer behavioral health among low-income African American youth, such as low school engagement, delinquency, mental health problems, drug use, and risky sex. However, fewer studies have examined protective factors for such behavioral health risk behaviors. This study sought to address this gap by examining whether high levels of self-esteem were associated with better behavioral health factors for this population. A survey was administered to a sample of 638 low-income African American adolescents in Chicago to examine the degree to which high self-esteem was associated with less delinquency, substance use, and sexual risk behaviors, and more school engagement, and whether such associations varied by gender. Stepwise linear and logistic regression models were estimated to assess the influence of self-esteem. Higher self-esteem for this sample of low-income African American adolescents was associated with lower rates of delinquency, drug use, and risky sexual behaviors and increased rates of school engagement. Gender moderated only a few of these relationships. These findings suggest that programs that promote high self–esteem alone or in combination with other resilience factors may promote better behavioral health factors for African American adolescents.     

Rapid penalized likelihood-based outlier detection via heteroskedasticity test

Outlier detection is fundamental to statistical modelling. When there are multiple outliers, many traditional approaches in use are stepwise detection procedures, which can be computationally expensive and ignore stochastic error in the outlier detection process. Outlier detection can be performed by a heteroskedasticity test. In this article, a rapid outlier detection method via multiple heteroskedasticity test based on penalized likelihood approaches is proposed to handle these kinds of problems. The proposed method detects the heteroskedasticity of all data only by one step and estimate coefficients simultaneously. The proposed approach is distinguished from others in that a rapid modelling approach uses a weighted least squares formulation coupled with nonconvex sparsity-including penalization. Furthermore, the proposed approach does not need to construct test statistics and calculate their distributions. A new algorithm is proposed for optimizing penalized likelihood functions. Favourable theoretical properties of the proposed approach are obtained. Our simulation studies and real data analysis show that the newly proposed methods compare favourably with other traditional outlier detection techniques.     

2-Distance coloring of planar graphs with girth 5

A vertex coloring is said to be 2-distance if any two distinct vertices of distance at most 2 receive different colors. Let G be a planar graph with girth at least 5. In this paper, we prove that G admits a 2-distance coloring with at most \(\Delta (G)+3\) colors if \(\Delta (G)\ge 339\).     

Objective Bayesian hypothesis testing in regression models with first-order autoregressive residuals

This article considers the objective Bayesian testing in the normal regression models with first-order autoregressive residuals. We propose some solutions based on a Bayesian model selection procedure to this problem where no subjective input is considered. We construct the proper priors for testing the autocorrelation coefficient based on measures of divergence between competing models, which is called the divergence-based (DB) priors and then propose the objective Bayesian decision-theoretic rule, which is called the Bayesian reference criterion (BRC). Finally, we derive the intrinsic test statistic for testing the autocorrelation coefficient. The behavior of the Bayes factor-based DB priors is examined by comparing with the BRC in a simulation study and an example.     

大数据背景下网络突发事件动态监测研究

通过互联网以及社交平台的数据监测社会突发异常事件是当前社交网络传播研究的热点问题,本文基于大数据背景,对网络突发事件动态监测算法进行了创新性研究.论文首先介绍了常用的几种网络动态监测算法,并指出了其在社交网络中应用的局限性,提出了基于Kleinberg的改进算法,最后用改进的算法进行了实证研究,研究结果显示:改进后的算法通过给定合理的调节参数,能迅速准确地监测到网络异常状况的发生,从而不仅避免了传统主观上直接通过突发事件出现的频次来划定临界值的不科学性和直接使用微博量排行榜方式所产生的时间上的滞后性,也避免了直接通过划定一个固定的微博增加量来判断是否有异常事件发生的不合理性.本文在大数据背景下为网络突变事件的动态监测提供了新的研究方法,为政府加强网络安全建设、优化网络监管模式、净化互联网环境具有一定的实践指导意义.     

GPU-accelerated Gibbs sampling: a case study of the Horseshoe Probit model

Statistics and Computing - Gibbs sampling is a widely used Markov chain Monte Carlo (MCMC) method for numerically approximating integrals of interest in Bayesian statistics and other mathematical...     

地区第三产业的水平评价

地区第三产业的水平评价刘成相,董礼华经过４０多年的发展,我国第三产业在国民经济中的地位日趋显著。特别是改革开放以来,随着第一。二产业的发展,第三产业发展的步伐加快,１９７９—１９９１年,平均每年以９．９％的速度增长,超过了同期国民生产总值８．６％的递...     

SNA的五大核算系统及其结合——新国民经济核算体系结构之剖析

新SNA的文件(即《国民经济核算体系》)中有一个“国民经济核算完整体系的例解”——88×88矩阵表。如果我们将它的表值内含和表值间联系用框图来标明,就可以得到如下的“新SNA图解”(见图1)。 这张图概括了新SNA的基本内容,从图中我们可以看出新SNA包含了五大核算系统;国民收入核算系统,其主体在图解中即是双线左方上方除去“金融资产”和“金融负债”的各子阵。投入产出核算系统,“中间消耗”子阵和“国内商品总产出”子阵及其他子阵的综合     

建立“国际收支核算矩阵”的构想

建立“国际收支核算矩阵”的构想邱东一、问题的提起纵观近年来国际经济发展,可以发现两个趋势：一是国际收支占ＧＮＰ的比重逐年上升Ｉ再一是国际经济活动区域化。由这两个趋势引发出分地区来分析国际收支状况的必要性,这需要一个合适的工具,本文提出“国际收支核算矩...