On a hyperplane arrangement problem and tighter analysis of an error-tolerant pooling design

In this paper, we formulate and investigate the following problem: given integers d,k and r where k>r≥1,d≥2, and a prime power q, arrange d hyperplanes on to maximize the number of r-dimensional subspaces of each of which belongs to at least one of the hyperplanes. The problem is motivated by the need to give tighter bounds for an error-tolerant pooling design based on finite vector spaces. This work is partially supported by NSF CAREER Award CCF-0347565.     

The Quality of Social Networks: Its Determinants and Impacts on Helping and Volunteering in Macao

Pro-social behaviors serve essential societal functions. This study examines the factors affecting the quality of social networks, in terms of network size and perceived respect. It further explores the role of social networks in enhancing helping intention and helping behaviors. Eight hundred and eighty people were randomly interviewed by phone. Results indicated that the level of social participation, trust, and social identification were positively related to the quality of the social networks. A better social network was related to a higher level of helping intention and longer hours of volunteer works.     

中国文学研究的困境与出路

采用新文学的观念 ,有系统的理论和科学的方法 ,来研究中国古代文学 ,是从 2 0世纪才开始的。从不同的层面对百年来的研究概况进行检讨就会发现 :就文学观念而言 ,散文和小说的分类观念至今尚未厘清 ;就理论系统而言 ,对传统的诗文理论 ,多泛泛模糊之谈 ,对外国理论则往往强加套用 ,给人浮薄无学的感觉 ;就研究方法而言 ,国学根柢越来越薄弱。要突破文学研究的这种困境 ,必须观念要厘清 ,理论要分明 ,方法要落实 ,根柢要深厚 ,还要加上“了解之同情”。     

Nonparametric methodology for the time-dependent partial area under the ROC curve

To assess the classification accuracy of a continuous diagnostic result, the receiver operating characteristic (ROC) curve is commonly used in applications. The partial area under the ROC curve (pAUC) is one of the widely accepted summary measures due to its generality and ease of probability interpretation. In the field of life science, a direct extension of the pAUC into the time-to-event setting can be used to measure the usefulness of a biomarker for disease detection over time. Without using a trapezoidal rule, we propose nonparametric estimators, which are easily computed and have closed-form expressions, for the time-dependent pAUC. The asymptotic Gaussian processes of the estimators are established and the estimated variance-covariance functions are provided, which are essential in the construction of confidence intervals. The finite sample performance of the proposed inference procedures are investigated through a series of simulations. Our method is further applied to evaluate the classification ability of CD4 cell counts on patient's survival time in the AIDS Clinical Trials Group (ACTG) 175 study. In addition, the inferences can be generalized to compare the time-dependent pAUCs between patients received the prior antiretroviral therapy and those without it.     

Patterns In Discourse About Elderly People In New Zealand

As the number of senior citizens continues to rise, their public profile will grow and political discussion about their future will become increasingly prominent. The present research was designed to approach such debate by providing an assay of naturally occurring data drawn from the New Zealand Royal Commission on Social Policy (1986–1988). Public submissions to the Royal Commission on the specific subject of senior citizens were extracted and examined from a discourse analytic perspective. The results obtained by two independent analyses showed three patterns of discourse, namely, society's obligations to senior citizens, anti-ageism, and old age as a positive resource. This troika of discourse patterns constitute a collective voice through which senior citizens and their supporters defend and advocate the social position of senior citizens.     

“两个根本性转变”与农业剩余劳动力的优化配置

文章论述了中国特殊国情下农业剩余劳动力及其转移的特点,并从农村经济的技术创新、体制创新及城乡劳动力全息循环流动三个方面探讨了农村剩余劳动力的出路。     

Public Awareness and Practice of Responsible Gambling in Macao

Responsible gambling (RG) is a relatively new concept to the Macao gambling industry. Although recent studies reported a heightened public awareness of RG, the prevalence of disordered gambling is still high. This discrepancy may suggest an existing gap between RG awareness and gambling practices, pinpointing aspects that need to be improved by different RG stakeholders. The gap may be attributable to people’s limited knowledge toward practices favoring RG. To explore means for enhancing the RG campaign, we studied Macao residents’ interpretation and adoption of RG practices. In Study 1, a random community sample was collected to assess the extent to which common RG practices were adopted. Results suggested that there was a fair proportion of gamblers not adhering to them and gambling disorder tendency was related to the adoption of RG practices. It implied a successful promotion of RG practices may reduce gambling problems. In Study 2, focus group discussions were conducted to explore how RG was conceptualized. Twenty-five participants (including 11 casino employees) took part in four focus group interviews. All participants were aware of RG but their knowledge of RG practices was limited. Very few of them were able to identify major practices such as putting constraints on gambling amount and time and the application for self-exclusion. We argue that future RG promotion needs to be more specific and behavior-oriented and it should also address various procedural concerns on how RG practices can be implemented.     

Residential mobility in an era of economic transformations and population reformations: A case study of Hong Kong

This paper compares the home-moving patterns of Hong Kong citizens in the periods of 1996–2001 and 2001–2006, highlighted by economic downturns, population reformations and subsequent housing policies adjustments during the second period. It is first shown in the findings that the supply of public housing, instead of its tenure, dictates home-moving propensities and patterns. Then, housing needs among elderly and pre-elderly people appears to be overwhelmed by social needs such as attachment and existing social networks, along with direct or indirect financial constraints. Besides, spatial lock-in appears to be more prevalent among Chinese immigrants as compared to non-Chinese immigrants, owed to the former's ties to local Hong Kong residents and subsequent eligibility for government assistance. Yet, despite the availability of jobs and schools, the recent trend of people moving out of new towns gradually turns these areas into marginalized communities clustered with poor people, alienated within and in a sense excluded from the city landscape altogether. A variety of policy implications, from public finance, allocation of social resources, to land use planning of rural areas and potential social conflicts, are discussed in response to the trend of population aging and immigrations from the Mainland.     

Investigating Importance Weighting of Satisfaction Scores from a Formative Model with Partial Least Squares Analysis

This study introduced a formative model to investigate the utility of importance weighting on satisfaction scores with partial least squares analysis. Based on the bottom-up theory of satisfaction evaluations, the measurement structure for weighted/unweighted domain satisfaction scores was modeled as a formative model, whereas the measurement structure for global satisfaction scores was modeled as a reflective model according to top-down theory. The purpose was to see if the predictive effect of importance-weighted domain satisfaction scores is stronger than unweighted domain satisfaction scores in predicting global satisfaction scores. Three datasets in life, self, and job satisfaction were analyzed. In the life satisfaction dataset, 237 undergraduates at Central Taiwan University of Science and Technology voluntarily provided their responses. The mean age of respondents was 20.80 years (SD = 1.05). In the self-satisfaction dataset, 269 undergraduates at National Taiwan University provided their responses. The mean age of respondents was 19.78 years (SD = 1.44). Finally, in the job satisfaction dataset, 557 staff members in seven Taiwan provincial hospitals provided their responses. The mean age of respondents was 35.87 years (range from 21 to 65, SD = 8.60). Three measures of domain satisfaction, domain importance, and global satisfaction were collected in each dataset. Partial least squares analysis was used in model estimation. All the results revealed that unweighted domain satisfaction scores have a stronger predictive effect for global satisfaction measures than importance-weighted domain satisfaction scores, indicating that importance weighting on satisfaction scores did not have an empirical benefit.     

Simultaneous pairwise multiple comparisons in a two-way analysis of covariance model

Pairwise comparison procedures are important and popular statistical techniques in many disciplines, such as physiology and agrobiology. In this paper, we seek to derive the statistical methods which enable one to perform pairwise comparisons in a two-way analysis of covariance model. The overall family-wise type I error rate is controlled at a designated level. The procedures are outlined for simultaneous inferences among treatment means. Numerical examples are given to illustrate our testing procedure.