Happiness of Hong Kong youth from 2000 to 2014: empirical evidence on the differential impact of socioeconomic conditions on youth versus other age groups

This paper aims to explain why Hong Kong youth have become unhappier than older people in recent years. We test in this connection six hypotheses, using random effects ordinal logistic regressions with a combined macro-micro dataset from official statistics and a longitudinal opinion survey project from 2000 to 2014. The results show that the decline in the happiness level in recent years is more significant for Hong Kong youth than for older people. We also find evidence of age heterogeneity in the impacts of both macroeconomic conditions and the housing price on happiness. GDP per capita has a weaker positive effect on youth’s happiness than it does on older people. The positive correlation between housing price and happiness is valid for older people only. Rapid economic growth and the rise in the price of housing have made older people happier than youth since the early 2010s.     

MODELING DIFFUSION OF MULTIPLE INNOVATIONS VIA MULTILEVEL DIFFUSION CURVES: PAYOLA IN POP MUSIC RADIO

Diffusion curve analysis can estimate whether an innovation spreads endogenously (indicated by a characteristic " s -curve") or exogenously (indicated by a characteristic negative exponential curve). Current techniques for pooling information across multiple innovations require a two-stage analysis. In this paper, we develop multilevel diffusion curve analysis, which is statistically more efficient and allows for more flexible specifications than do existing methods. To substantively illustrate this technique, we use data on bribery in pop radio as an example of exogenous influence on diffusion.     

Steady-State Solutions to PBPK Models and Their Applications to Risk Assessment I: Route-to-Route Extrapolation of Volatile Chemicals

Although analysis of in vivo pharmacokinetic data necessitates use of time-dependent physiologically-based pharmacokinetic (PBPK) models, risk assessment applications are often driven primarily by steady-state and/or integrated (e.g., AUC) dosimetry. To that end, we present an analysis of steady-state solutions to a PBPK model for a generic volatile chemical metabolized in the liver. We derive an equivalent model that is much simpler and contains many fewer parameters than the full PBPK model. The state of the system can be specified by two state variables-the rate of metabolism and the rate of clearance by exhalation. For a given oral dose rate or inhalation exposure concentration, the system state only depends on the blood-air partition coefficient, metabolic constants, and the rates of blood flow to the liver and of alveolar ventilation. At exposures where metabolism is close to linear, only the effective first-order metabolic rate is needed. Furthermore, in this case, the relationship between cumulative exposure and average internal dose (e.g., AUCs) remains the same for time-varying exposures. We apply our analysis to oral-inhalation route extrapolation, showing that for any dose metric, route equivalence only depends on the parameters that determine the system state. Even if the appropriate dose metric is unknown, bounds can be placed on the route-to-route equivalence with very limited data. We illustrate this analysis by showing that it reproduces exactly the PBPK-model-based route-to-route extrapolation in EPA's 2000 risk assessment for vinyl chloride. Overall, we find that in many cases, steady-state solutions exactly reproduce or closely approximate the solutions using the full PBPK model, while being substantially more transparent. Subsequent work will examine the utility of steady-state solutions for analyzing cross-species extrapolation and intraspecies variability.     

Risk factors for suicide in Taiwanese college students

OBJECTIVE: The authors investigated the personality characteristics, psychopathology, parenting style, and family function among Taiwanese college students with high, moderate, and low suicidal risks. PARTICIPANTS: The sample included 2,919 first-year college students (1,414 men, 1,505 women) from a university in Taipei, Taiwan. METHODS: A self-administered questionnaire assessed domains covering demographics, personality, psychopathology, frequency of substance use, parenting style, family functioning, and suicidal behaviors. The authors used mixed models for data analysis. RESULTS: The authors observed a positive linear trend between increased suicidal tendency and levels of neuroticism, harm avoidance, novelty seeking, psychopathology, and parenting styles of low affection, overprotection, and authoritarian controlling. Use of tobacco and alcohol and impaired family adaptation and cohesion were associated with high and moderate suicidal risks. CONCLUSIONS: Personality, psychopathology, substance use, and familial factors are important correlates of suicidal risks among college students in Taiwan. Optimal suicide prevention strategies in the college setting should incorporate the multiple facets of suicidal risks.     

Winding Road Toward the Chinese Dream: The U-shaped Relationship Between Income and Life Satisfaction Among Chinese Migrant Workers

This study examines the relationship between income and subjective well-being among rural-to-urban migrant workers in China. Our analysis of a recent survey uncovered a U-shaped relationship between income and overall life satisfaction for migrant workers in Shanghai. Furthermore, the positive correlation is curvilinear, showing that increasing income yields diminishing returns. Drawing upon ethnographic literature concerning migrant workers, we suggest several possible explanations. For the poorest migrant workers, small increases in income are correlated with longer working hours and increased social comparison with their urban neighbors. After migrant workers’ income reaches a certain level, however, they are able to save money, giving them hope for future social mobility. Furthermore, migrant workers with disposable income can purchase status symbols, helping them to partially overcome their stigmatized status. The positive effect of income on life satisfaction eventually reaches a plateau, however, as even the wealthiest migrant workers find that they cannot surpass the limitations presented by their outsider identity and lack of an urban residence permit. Other findings include a negative relationship between income and income satisfaction and a positive relationship between education and income satisfaction. We conclude that the unique context surrounding Chinese migrant workers alters the typical effects of certain factors upon well-being and satisfaction.     

Relational schemas as sources of evaluation and misevaluation of leader–member exchanges: Some initial evidence

We investigated whether dyad members' relational schemas, a cognitive representation of exchange experiences, would affect how leaders and members evaluate and misevaluate the quality of their exchange relationships. Based on data derived from repertory grid technique and two waves of survey data, we found that leaders and members tended to form different relational schemas of their partners. While leaders developed LMX schemas focusing on work-related issues, members' schemas focused more on interpersonal concerns. These findings confirmed that the different schemas employed by each party affect how they stored, retrieved and (mis)evaluated their LMX experiences with each other. Implications for theory and practice, limitations of this study, and future research directions are discussed.     

An unbiased estimator for the survival function of censored data

A monotonic. pointwise unbiased and uniformly consistent estimator for the survival function of failure time under the random censorship model is proposed. This estimator is closely related to the Kaplan-Meier. the Nelson-Aalen. and the reduced sample estimator. Large sample properties of the new estimator are discussed.     

Age Replacement Policy with a Safety Constraint via the Bayesian Method

Consider a system that is subject to shocks that arrive according to a non homogeneous Poisson process. As the shocks occur, the system has m + 1 failure modes including the following: (i) a non repairable failure (catastrophic) mode that calls for a replacement and (ii) m repairable failure (non catastrophic) modes that are rectified by minimal repairs. In this article, we propose an age-replacement model with minimal repair based on using the natural conjugate prior of Bayesian method. In addition, a safety constraint is considered to control the risk of occurring catastrophic failures in a specified time interval. The minimum-cost replacement policy is studied in terms of its existence and safety constraint. A numerical example is also presented to illustrate the proposed model.