Bathtub distributions: a review

Bathtub distributions are characterized by bathtub failure rate functions . These are possibly more realisitic models than the monotone failure rate models . A systematic account of such distributions is not available and this review aims to give such an account . We give some easily verifiable conditions to check the bathtub property of a distribution along with methods to construct such distributions . We also discuss some stochastic and reliablity mechanisms which lead to bathtub distributions. These include mixtures ( stochastic failure rate models ) , series system , stochastic differential equation models and so on. We also review inference on bathtub distributions. The paper concludes with a rather exhaustive list of bathtub distributions.     

Media and Popular Culture Representations of LGBT Bullying

SUMMARY

This article critically reviews diverse representations of bullying of gay, lesbian, bisexual and transgender people in contemporary media: cinema, television, journals, Web sites, fiction, children's books, comics, music, advertising, and pornography.     

An Analysis of Rhetorical Devices in Advertisement

Advertisement is closely related to our daily life, trying to persuade customers to purchase different kinds of products with garish propaganda. As a result, various rhetorical devices are widely employed in advertisement due to their special functions in people＇ s consuming.     

Robust methods of estimation of regression coefficients 1

Recently, cumulative residual entropy (CRE) has been found to be a new measure of information that parallels Shannon's entropy (see Rao et al. [Cumulative residual entropy: A new measure of information, IEEE Trans. Inform. Theory. 50(6) (2004), pp. 1220–1228] and Asadi and Zohrevand [On the dynamic cumulative residual entropy, J. Stat. Plann. Inference 137 (2007), pp. 1931–1941]). Motivated by this finding, in this paper, we introduce a generalized measure of it, namely cumulative residual Renyi's entropy, and study its properties. We also examine it in relation to some applied problems such as weighted and equilibrium models. Finally, we extend this measure into the bivariate set-up and prove certain characterizing relationships to identify different bivariate lifetime models.     

Two ways of modelling overdispersion in non-normal data

For non-normal data assumed to have distributions, such as the Poisson distribution, which have an a priori dispersion parameter, there are two ways of modelling overdispersion: by a quasi-likelihood approach or with a random-effect model. The two approaches yield different variance functions for the response, which may be distinguishable if adequate data are available. The epilepsy data of Thall and Vail and the fabric data of Bissell are used to exemplify the ideas.     

“后百亿时代”:以文化自律与创新推动电影产业再度振兴

中国电影在赢得100亿票房的业绩后,事实上,正面临着新一轮的文化挑战。突出的问题在于,当下市场严重失序,失去了文化的自律性,逐步形成了一种市场金本位的定势。吸金的思维定势代替了人文的主体性以及艺术的创新与智慧,开启了一种仅以GDP增长为目标的市场方向,造成人文原创性的匮乏以及大片的文化贫血症。针对此种现状,我们应当考虑的不是创造了多少GDP新高,而是今后能否以文化的自律性与艺术的创新精神来提升电影的思想力度与文化品格,在社会审美的意义上实现向现代审美的转换。电影作为文化产品,其固有的精神本源性及其核心价值应是第一位的。因此,我们必须自觉地肩负起时代赋予的文化使命与责任,引导我们的电影产业在与文化的和谐共生中实现再度振兴,为将电影产业做成我们国民经济支柱性产业的伟大目标而努力奋进。     

Diagnostic tools in generalized Weibull linear regression models

We propose some statistical tools for diagnosing the class of generalized Weibull linear regression models [A.A. Prudente and G.M. Cordeiro, Generalized Weibull linear models, Comm. Statist. Theory Methods 39 (2010), pp. 3739–3755]. This class of models is an alternative means of analysing positive, continuous and skewed data and, due to its statistical properties, is very competitive with gamma regression models. First, we show that the Weibull model induces ma-ximum likelihood estimators asymptotically more efficient than the gamma model. Standardized residuals are defined, and their statistical properties are examined empirically. Some measures are derived based on the case-deletion model, including the generalized Cook's distance and measures for identifying influential observations on partial F-tests. The results of a simulation study conducted to assess behaviour of the global influence approach are also presented. Further, we perform a local influence analysis under the case-weights, response and explanatory variables perturbation schemes. The Weibull, gamma and other Weibull-type regression models are fitted into three data sets to illustrate the proposed diagnostic tools. Statistical analyses indicate that the Weibull model fitted into these data yields better fits than other common alternative models.     

河南省大学影视教育现状及应对策略

大学影视教育分为专业教育、普及教育两个方面,专业学科教育、专业课程教育、公共普及教育三个层次。我省高校影视教育现状为:专业教育系科设置少,普及教育课程开设稀少;教材建设几乎为零,师资队伍建设极为薄弱;影视教育的无序性、市场性,导致大学生影视观赏的盲目性、负面性。当务之急的对策是:营造良好的影视教育氛围;制定可行的影视教育目标;建立高素质的影视教育教师队伍。     

配额制对近期国内电影市场自给率的影响

此项研究主要考察电影配额制及其它相关因素对电影市场自给率的影响。回归模型表明，配额制与自给率正相关的假设并不成立，因而暗示了配额制或许并不能有效的限制国外电影进入本国市场。国内生产总值，票房收益和制作投资被认为是决定自给率的最强有力的三大因素，而文化折扣和英语语言是非决定性因素。     

随钻声波测井数据实时压缩算法

针对随钻测井信号低传输速率特性，结合随钻声波测井时数据量大的实际，研究了波列数据实时在线压缩算法。在分析随钻声波测井信号特征的基础上，建立了基线和波形相结合的分段压缩