Extreme values identification in regression using a peaks-over-threshold approach

The problem of heavy tail in regression models is studied. It is proposed that regression models are estimated by a standard procedure and a statistical check for heavy tail using residuals is conducted as a tool for regression diagnostic. Using the peaks-over-threshold approach, the generalized Pareto distribution quantifies the degree of heavy tail by the extreme value index. The number of excesses is determined by means of an innovative threshold model which partitions the random sample into extreme values and ordinary values. The overall decision on a significant heavy tail is justified by both a statistical test and a quantile–quantile plot. The usefulness of the approach includes justification of goodness of fit of the estimated regression model and quantification of the occurrence of extremal events. The proposed methodology is supplemented by surface ozone level in the city center of Leeds.     

Optimal site area for high-density housing development

This study provides an empirical assessment of the optimal site area for master-planned high-density housing development in Hong Kong. Conventional hedonic pricing methods are not used because they cannot separate the amenity value of large sites from the price effects caused by market power. We obtain our estimate from a unique data set containing the choice of applicants for public housing units in 128 housing estates in Hong Kong between 1990 and 1998. An inverted U-shaped relationship between site area and popularity of the estate is revealed. We conclude that the land areas of most public housing estates in Hong Kong are sub-optimal. Our estimated optimal site area serves as a quantitative benchmark for the government in its future disposal of public as well as private housing land.     

Optimal fractional factorial designs and their construction

Optimal symmetrical fractional factorial designs with n$n$ runs and m$m$ factors of s$s$ levels each are constructed. We consider only designs such that no two factors are aliases. The minimum moment aberration criterion proposed by Xu (2003) is used to judge the optimality of the designs. The minimum moment aberration criterion is equivalent to the popular generalized minimum aberration criterion proposed by Xu and Wu (2001), but the minimum moment criterion is simpler to formulate and employ computationally. Some optimal designs are constructed by using generalized Hadamard matrices.     

Majority vote of even and odd experts in a polychotomous choice situation

The performance of majority vote by an odd number of voters in a dichotomous situation is a much-studied subject. In this paper, we study the performance of group consensus in a situation of polychotomous choice. The differences in majority vote behaviour between even and odd numbers of expert panellists are examined, and the effects of adding new members are derived. Unlike the dichotomous model, optimality in the present context may not be uniquely defined, so the probabilities of the consensus being correct or erroneous are both considered as the number of experts is increased.     

Calibrated Ambitions: Low Educational Ambition as a Form of Strategic Adaptation Among Chinese Youth in Spain

Deemed “model minorities,” second‐generation Chinese‐Americans have, on average, high levels of educational attainment and, as a result, they have experienced more upward mobility than other groups. Yet, on the other side of the Atlantic, a strikingly different story about Chinese immigrants and their offspring emerges. Based on analysis of the Longitudinal Study of the Second Generation in Spain, findings from this study show that Chinese youths in Spain have substantially lower educational ambitions and attainment than youths from every other nationality. Met with discrimination at school and in the labor market, yet finding financial success in niche markets as small business owners, I argue that the Chinese in Spain have, at least temporarily, forged an alternative pathway of mobility based on entrepreneurial endeavors rather than educational accomplishments – a formula passed on from immigrant parents to their offspring. The way Chinese youths in Spain have calibrated their ambition represents a form of strategic adaptation to the barriers put up against immigrant minorities in Spanish society.     

Voting rights for alien residents--who wants it?

Foreign nationals permanently domiciled in Sweden have been entitled since 1975 to vote and to municipal and county council elections. This article examines some of the major issues associated with international migration and disenfranchisement of migrants created by a contradiction between economic and political rationale. The alien population of Sweden remained small for a long time, but during the 1960s it rose 1st to 300,000 and later to 400,000 persons. Since 1970, aliens have constituted roughly 5% of the total national population of 8.3 million. Surveys following the 3 elections held in Sweden so far have shown immigrants to be quite well informed concerning election procedures and the parties. In contrast to single males, women with children tend to be highly stable, because of favorable social security for women, particularly for women with children. Participation elections among women (55%) is higher than among men (49%), and married women (58%) are usually the highest participants. Class-voting is still rather strong in Sweden; the percentage difference in preference for Socialist parties between working-class and middle-class was as high 55% in 1960. Long term trends in the distribution of party-preference among immigrants are determined to a large extent by the policy on immigration regulation and political asylum for refugees and exiles. Another selectivity is due to the differential remigration rate. A 1976 study showed that although local franchise of immigrants is now the law of the land, some Swedes are still against the granting of voting rights and electability to immigrants. On the whole, there is clearly a psychological environment conducive, at least in Stockholm, to the task of putting local franchise reform into real practice.     

Generalised additive mixed models analysis via gammSlice

We demonstrate the use of our R package, gammSlice, for Bayesian fitting and inference in generalised additive mixed model analysis. This class of models includes generalised linear mixed models and generalised additive models as special cases. Accurate Bayesian inference is achievable via sufficiently large Markov chain Monte Carlo (MCMC) samples. Slice sampling is a key component of the MCMC scheme. Comparisons with existing generalised additive mixed model software shows that gammSlice offers improved inferential accuracy, albeit at the cost of longer computational time.     

Older Single Gay Men’s Body Talk: Resisting and Rigidifying the Aging Discourse in the Gay Community

Previous research saw older gay men as subject to structural marginalization of ageism but yet possessing agency to interpret aging in diverse ways. I move beyond this duality, drawing on the theory of defensive othering to understand how older gay men live with the aging discourse in the gay community. Informed by grounded theory, I analyzed interviews with 25 self-identified single gay men aged 50 or above in England inductively. It emerged that many older gay men found it difficult to escape the discourse that marginalizes the aging body. Even when they argued they were the exception and “looked good,” they were discursively producing a two-tier system: they themselves as the “good older gay men,” as opposed to the other “bad older gay men,” who “had given up.” Such a defensive othering tactic seemingly allowed them to resist age norms from applying to them personally, but unintentionally reinforced an ageist discourse.     

School‐based human rights education: case studies in Hong Kong secondary schools

In an era of rapid globalization, space and time are seriously compressed. People from different nations, cultures, religions and other backgrounds have become much more interconnected and interdependent. Since people are rapidly intermingling, what values should be considered as standards and norms in regulating this situation, so that people of different backgrounds can relate peacefully to each other with mutual respect? United Nations (UN) human rights standards could be considered as sets of shared global norms and values in a search for global ethics. As a consequence, the UN has been eager to promote human rights education (HRE), aiming at the cultivation of a human rights culture. This paper reports on two case studies of school‐based curriculum development of HRE in two Hong Kong secondary schools. We also recommend some research directions important for the implementation of HRE in schools. It is hoped that the paper can provide some insight into the development of quality HRE in schools.