地位焦虑、物质主义与炫耀性消费——中国人物质主义倾向的现状、前因及后果

通过对369份有效样本的层级回归进行实证检验,结果显示:中国人确实存在较高的物质主义倾向,且在人口统计因素上存在差异,其中男性比女性具有更高的物质主义倾向;家庭收入越高,物质主义倾向也越高;不同教育程度和年龄对物质主义倾向的影响不够显著.在中国社会转型背景下,人们的地位焦虑与物质主义倾向显著正相关;物质主义倾向与中国人的炫耀性消费显著正相关;物质主义倾向在地位焦虑与炫耀性消费之间起着中介作用.     

北京网络游戏用户策略对媒体融合的启示

网络游戏作为一种文化内容和经济利益相结合的传播载体,一直在用户的培养和维系上具有独特的观念和策略.传统媒体与新媒体的融合应该学习这种新的观念和策略来培养"用户".以北京市的部分重点网络游戏企业为案例,对媒介融合的"用户"观念进行分析,通过梳理其用户策略,提出应从用户关系、 内容生产以及体验创新三个方面加以借鉴和应用,打造一个能够拓展用户生产内容、 发展社交关系并且获得精细体验及人性化服务的平台.     

网络约车与出租车的竞争博弈研究——以平台补贴为背景

通过建立平台价格补贴背景下的网络约车与出租车的竞争博弈模型,分析平台价格补贴变化对网络约车与出租车的价格、 市场需求和利润的影响.研究发现,当平台给予消费者补贴较大而给予网络约车司机补贴较小时,网络约车定价可取得最大值;当出行前偏好搭乘网络约车的消费者较少时,在出行时刻真正搭乘的消费者数量远高于出行前的数量;而出行前偏好搭乘网络约车的消费者较多时,即使网络约车对消费者和平台司机维持高额补贴策略,在出行时刻真正搭乘的消费者数量却远小于出行前的消费者偏好数量.所以,传统的出租车市场不会在互联网迅猛发展、 平台高额补贴策略等冲击下彻底消失,其仍然会占有一定的市场份额.     

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Moments of order statistics of Topp–Leone distribution

We derive explicit algebraic expressions for both of the single and product moments of order statistics from Topp–Leone distribution. We also give an identity about single moments of order statistics. These expressions will be useful for computational purposes.     

How to improve the fit of Archimedean copulas by means of transforms

The selection of copulas is an important aspect of dependence modeling issues. In many practical applications, only a limited number of copulas is tested and the copula with the best result for a goodness-of-fit test is chosen, which, however, does not always lead to the best possible fit. In this paper we develop a practical and logical method for improving the goodness-of-fit of a particular Archimedean copula by means of transforms. In order to do this, we introduce concordance invariant transforms which can also be tail dependence preserving, based on an analysis on the λ-function, l = \fracjj￠{\lambda=\frac{\varphi}{\varphi'}}, where j{\varphi} is the Archimedean generator. The methodology is applied to the data set studied in Cook and Johnson (J R Stat Soc B 43:210–218, 1981) and Genest and Rivest (J Am Stat Assoc 88:1043–1043, 1993), where we improve the fit of the Frank copula and obtain statistically significant results.     

SB-robust estimator for the concentration parameter of circular normal distribution

In this paper we discuss robust estimation of the concentration parameter (κ) of the circular normal (CN) distribution. It is known that the MLE of the concentration parameter is not B-robust at the family of all circular normal distributions with fixed mean direction (μ) and varying κ > 0. In this paper we propose a new estimator for κ and show that it is B-robust and SB-robust at the family {CN(μ, κ) : m ≤ κ ≤ M} where m and M are two arbitrary constants.     

Comparison of estimators in nested case–control studies with multiple outcomes

Reuse of controls in a nested case-control (NCC) study has not been considered feasible since the controls are matched to their respective cases. However, in the last decade or so, methods have been developed that break the matching and allow for analyses where the controls are no longer tied to their cases. These methods can be divided into two groups; weighted partial likelihood (WPL) methods and full maximum likelihood methods. The weights in the WPL can be estimated in different ways and four estimation procedures are discussed. In addition, we address modifications needed to accommodate left truncation. A full likelihood approach is also presented and we suggest an aggregation technique to decrease the computation time. Furthermore, we generalize calibration for case-cohort designs to NCC studies. We consider a competing risks situation and compare WPL, full likelihood and calibration through simulations and analyses on a real data example.     

Estimating detailed distributions from grouped sociodemographic data: ‘get me started in’ curve fitting using nonlinear models

In much demographic analysis, it is important to know how occurrence-exposure rates or transition probabilities vary continuously by age or by time. Often we have coarse or fluctuating data so there can be a need for estimation and smoothing. Since the distributions of rates or counts across age or another variable are often curved, a nonlinear model is likely to be appropriate. The main focus of this paper is on the estimation of detailed information from grouped data such as age and income bands; however, the methods we outline could also be applied to other settings such as smoothing rates where the original data are ragged. The ability to carry out curve fitting is a very useful skill for population geographers and demographers. Curve fitting is not well covered in statistics textbooks, and whilst there is a large literature in journals thoroughly discussing the detail of functions which define curves, these texts are likely to be inaccessible to researchers who are not specialists in mathematics. We aim here to make nonlinear modelling as accessible as possible. We demonstrate how to carry out nonlinear regression using SPSS, giving stepped-through hypothetical and research examples. We note other software in which nonlinear regression can be carried out, and outline alternative methods of curve fitting.