Discrete time-varying demand lot-sizing models with learning and forgetting effects

This paper deals with the problem of incorporating both learning and forgetting effects into discrete timevarying demand lot-sizing models to determine lot sizes. Forgetting is retrogression in learning which causes a loss of labour productivity due to breaks between intermittent production runs. Formulae are derived for calculating the production cost required to produce the first unit of each successive lot over a finite planning horizon. An optimal lotsizing model and three heuristic models are developed by extending the existing models without learning and forgetting considerations. Numerical examples and computational experience indicate that larger lot sizes are needed when the phenomenon of learning and forgetting exists. Several important conclusions are drawn from a comparison of the three heuristic solutions with the optimal solution, and suggestions for future research and for lot-size users to choose an appropriate lot-sizing technique are made.     

Getting Ahead in the Capitalist Paradise: Migration from China and Socioeconomic Attainment in Colonial Hong Kong1

This article examines the initial labor market outcome and the subsequent mobility process of Chinese immigrants in Colonial Hong Kong using complete work history data and event history modeling. Contrary to the rhetoric that Hong Kong is a capitalist paradise for adventurers, the data showed that immigrants were penalized in their initial class placement, subsequent mobility, and current income attainment. Differences in educational attainment and the lack of transferability of pre‐migration human capital partly explained the attainment gap between immigrants and the natives. Yet the disadvantage of immigrants was also embedded in the local economic structure. The process of deindustrialization significantly lowered the chance of immigrants getting good first jobs when entering the labor market. Moreover, since deindustrialization benefited the natives by providing them with more opportunities in the service sector, it inadvertently widened the gap in upward mobility chances between natives and immigrants.     

Estimation of elderly housing demand in an Asian city: Methodological issues and policy implications

Projection of elderly housing demands and needs has always been complex because of the volatility and heterogeneity of the factors involved. This paper argues that in a society where the tradition of elderly parents co-habiting with the children's family is breaking up, the projection of elderly housing demands for planning and policy purposes may not be scientifically possible. This owes to the impossibility to gauge housing affordability of the elderly by conventional indicators and the lack of information on the market behaviour of the elderly alone. This paper suggests the analysis of pre-retirement income, housing arrangements and housing aspiration to help elderly housing service providers to make more informed decisions. However, the projection of housing needs is more plausible if the underlying demographic projection models take care of major demographic trends such as household sizes and types, and if surveys are carried out to gauge housing aspirations of contemporary elderly persons. By using the above methods, the paper projected the future elderly housing needs and demands of Hong Kong, and found that public rental housing was perceived as the most secure type of housing regardless of affordability. This preference may reflect anomalies in elderly policies, particularly the lack of housing choices to suit the varied needs and affordability.     

Allegations of maltreatment and delinquency: Does risk of juvenile arrest vary substantiation status?

There exists a healthy debate about the process and value of substantiation in child welfare. Much of this debate focuses on understanding whether substantiated and unsubstantiated allegations of maltreatment share equal risk of recurrence. In the current study we seek to advance this debate by extending the analyses to focus specifically on the risk of juvenile delinquency. We also seek to determine whether the relationship between substantiation and delinquency varies by race and gender. Our sample includes 38,223 youth between 5 and 16 years of age from Los Angeles County. We use propensity score matching to create relatively equivalent groups and use Cox Regression to model the risk of juvenile arrest. The results indicate that the relative risk ratio of arrest is 2.2 times greater for youth associated with a substantiated report of maltreatment as compared with similar youth associated with an unsubstantiated report of maltreatment. Older youth, and African American youth are also at an increased risk of juvenile arrest. These findings indicate that the process of substantiation is not without merit - as investigators and supervisors are clearly able to distinguish cases based on individual risks and strengths.     

Quality of Life in Hong Kong: the Cuhk Hong Kong Quality of Life Index

The CUHK Hong Kong Quality of Life Index, which aims to assess and monitor the quality of life in Hong Kong, is a composite index incorporating both objective and subjective measures. This index, developed by the Faculty of Social Science of The Chinese University of Hong Kong, employs data collected in representative sample surveys and official statistics. A wide range of life domains is covered and the year 2002 is taken as the base year of the study. Index scores demonstrate that in general the quality of life in Hong Kong has improved slightly in 2003; scores of the composite index and the three sub-indices on sectorial performance are somewhat higher than those of the previous year. It is noteworthy that Hong Kong has made noticeable progress and performs as well as many economically advanced societies in certain life domains; yet, the well-being of the people relies on further improvement in others.     

Construction of Health Indices Using Paired Comparisons

The paper discusses, by making use of past experiences in the area, the main issues and the methodology of developing a health status instrument for a developing country from a well-established instrument. The use of Thurstone's model of paired comparisons in evaluating the relative importance of health symptoms has been reviewed and some alternative models, i.e., Linear, Exponential, and Information, are proposed. By applying the models to the health data of Chinese elderly persons, the three models have been demonstrated to be able to produce some valid and responsive health scores.     

Does the Hispanic Paradox in U.S. Adult Mortality Extend to Disability?

Studies consistently document a Hispanic paradox in U.S. adult mortality, whereby Hispanics have similar or lower mortality rates than non-Hispanic whites despite lower socioeconomic status. This study extends this line of inquiry to disability, especially among foreign-born Hispanics, since their advantaged mortality seemingly should be paired with health advantages more generally. We also assess whether the paradox extends to U.S.-born Hispanics to evaluate the effect of nativity. We calculate multistate life tables of life expectancy with disability to assess whether racial/ethnic and nativity differences in the length of disability-free life parallel differences in overall life expectancy. Our results document a Hispanic paradox in mortality for foreign-born and U.S.-born Hispanics. However, Hispanics’ low mortality rates are not matched by low disability rates. Their disability rates are substantially higher than those of non-Hispanic whites and generally similar to those of non-Hispanic blacks. The result is a protracted period of disabled life expectancy for Hispanics, both foreign- and U.S.-born.     

Repeated significance tests based on likelihood ratio statistics

For a specified decision rule, a general class of likelihood ratio based repeated significance tests is considered. An invariance principle for the likelihood ratio statistics is established and incorporated in the study of the asymptotic theory of the proposed tests. For comparing these tests with the conventional likelihood ratio tests, based solely on the target sample size, some Bahadur efficiency results are presented. The theory is then adapted in the study of some multiple comparison procedures     

Sibship Characteristics and Transition to First Marriage in Taiwan: Explaining Gender Asymmetries

Sociologists have long been interested in the effects of sibship structures. Although previous research generally focuses on the impacts of sibship characteristics on educational outcomes, these characteristics may also affect individuals?? decisions about marriage by shaping their resource availability, parental expectations, or social skills and contacts. Using a nationally representative sample from Taiwan, we examine how sibship size, birth-order rank, and sibship sex composition are associated with men??s and women??s transitions to first marriage. The analysis shows that men who have no male siblings tend to accelerate their rates of entering marriage. By contrast, women with more siblings or in earlier birth positions are likely to do the same. We argue that the findings for women reflect the influences of sibship structures on household resource allocation, whereas those for men have to do with the cultural emphasis on sons?? responsibility for carrying on the family lineage. Moreover, Chinese cultural norms that prescribe different roles for married sons and daughters account for the asymmetrical mechanisms revealed for men and women in Taiwan. Results from this study thus underscore the need to consider family norms and cultural contexts in explaining the transition to marriage.     

How Unpopular Policies are Made: Examples from South Africa,Singapore and Bangladesh

In this article we contribute to the emerging knowledge on migration policy‐making in two ways. Firstly, we address the relative lack of research on the gendered nature of migration policy‐making. Secondly we contribute to understanding migration policymaking in postcolonial contexts. Based on case studies from Bangladesh, South Africa, and Singapore, we trace the drivers of policy change in these contexts and how the gendered vulnerability of the intended beneficiaries impacted the policy process. We found that there were four main drivers of migration policy‐making in each of the countries. They were: the role‐players in the policy change process, the debates that shaped the policy change, the research involved, and the political context in which the policy change took place. While our research drew on existing policy frameworks, it also showed that policy development is shaped by complex socio‐political conditions.