Frequency Domain Log-linear Models; Air Pollution and Mortality

Motivated by a study of the association between counts of daily mortality and air pollution, we present a frequency domain estimation approach for log-linear models that accounts for both overdispersion and autocorrelation. The methods also allow for the discounting or downweighting of information at particular frequencies at which, for example, confounding variables are likely to have greatest influence. This allows flexible sensitivity analyses to be carried out to assess the possible effect of confounders on the estimated effect. We apply the methods to estimate the association between counts of mortality and the concentration of airborne particles in Philadelphia, USA, for the years 1974–1988. We obtain an estimated effect of particulate air pollution on mortality that is significantly greater than zero but less than that obtained by a standard log-linear analysis.     

Young and Older Caregivers at Homeless Animal and Human Shelters: Selfish and Selfless Motives in Helping Others

In the present study, young (n = 34) and older(n = 70) adult volunteers at either animal (n= 48) or human (n = 56) homeless shelters were asked to complete measures of caregiver stress/satisfaction, volunteer motives, and social desirability. Young compared to older volunteers assisting animals, but not humans, reported a significantly higher caseload and spending significantly more time per visit with their clients. In addition, young volunteers reported significantly higher levels of caregiver stress with humans more than animals. Also, volunteers at human (but not animal) homeless shelters claimed the need for meeting social expectations as a motive for community service. Furthermore, younger compared to older volunteers reported gaining relevant career experience, obtaining a knowledge of the plight of others, relieving aversive emotions, and meeting normative expectations as significant motives for volunteering. These results may have important implications for recruitment and training of community volunteers at homeless shelters.     

一位欧洲女人在中国

在回顾中国改革30年成果的基础上,本文试图以重访中国的一位欧洲女人的观点,总结中国经验的历史意义及其思想文化基础,同时也对中欧思想文化的特点进行比较.     

Becoming involved in raising a relative's child: reasons, caregiver motivations and pathways to informal kinship care

Interviews with 207 informal kinship caregivers describe a dynamic process that influences how children come to live with a relative other than their parent. This process involves three overlapping and often simultaneously occurring factors: (1) the reasons the children's parents were unable to care for them; (2) the caregiver's motivation for assuming responsibility for the child; and (3) the pathways or routes that children took to the caregiver's home. Understanding these factors and their mutual and simultaneous influence is important as we shape policies, programs and interventions to support families as they consider whether to care for a relative's child and once they assume this responsibility.     

Die Dynamik von Führung, Vertrauen und Konflikt in virtuellen Teams

The importance of virtual teams for collaboration of globally networked organizations has long been debated. But although this new form of division of labor appears in nearly all companies, which poses special challenges to managers and team members, scientific findings and recommendations have not sufficiently been integrated into practice so far. This article discusses on the one hand the challenges and opportunities of virtual teams, on the other hand wants by the presenting of scientific findings both provide food for thought, as well as concrete recommendations for implementation in practice.     

Family Work Trends and Practices:1971 to 1991

Families are allocating their time in an increasingly market-oriented fashion, with a decreasing proportion of labor hours being devoted to unpaid work. This article analyzes two aspects of the changing allocation of time. First, using longitudinal data from 1971 to 1991, the nature of the changes in how the families have changed their allocation of time between market and non-market alternatives is examined. Next, how family types have changed their allocations over the same period are examined. The Panel Study of Income Dynamics is used for this analysis.Results of this research indicate that the proportion of time spent on household labor among men has increased over individual men's life cycles and between cross-sectional cohorts. However, women continue to devote more hours to household labor than men. The number of hours women spend in the labor force are increasing, but the number of hours women spend in the labor force is still less than the number of hours men spend in the labor force. While the families in the longitudinal analysis have been able to maintain fairly stable work and income patterns, the cross-sectional data indicate that families need to devote an increasing number of hours to the labor market to maintain economic stability.     

Testing for co-directional interactions using union–intersection and intersection–union methods

When interaction terms exist in a two-factor, factorial experiment, the consideration and analysis of main effects are often restricted to those situations where the interaction between factors is not significant. Hinkelman and Kempthorne [4 Hinkelmann, K. and Kempthorne, O. 1994. Design and Analysis of Experiments. Volume 1: Introduction to Experimental Design, New York: Wiley.  [Google Scholar]] softened that stance somewhat and advocate testing main effects when the interaction is deemed co-directional but not anti-directional. A test for the main effects in that situation may be pragmatic to the practitioner and appealing to researchers in other disciplines. Intersection–union and union–intersection methods are examined for assessing the directional nature of significant interactions so that the main effects in a two-factor factorial may be evaluated. The tests suggested are conceptually straightforward and practical and maintain the nominal Type-I error rate. Examples are provided to illustrate the methods.     

Does the Reason Matter? Variations in Childlessness Concerns Among U.S. Women

Does the reason why women have no children matter with regard to level of childlessness concerns? Reasons include biomedical barriers, situational barriers, delaying motherhood, and choosing to be childfree. The concept of “childlessness concerns” captures the idea that holidays and family gatherings are difficult because of not having children or feeling left out or sad that others have children. Life course and identity theories guided the structural equation model analyses of a representative sample of 1,180 U.S. women without children from the National Survey of Fertility Barriers. The results indicated that women with the least control over pregnancy, those with biomedical barriers, had the highest childlessness concerns. As hypothesized, the association between reasons and childlessness concerns was mediated by the identity‐relevant measure, importance of motherhood. Contrary to the authors' hypothesis, the association was not mediated by social messages to have children. Thus, it is primarily involuntarily childless women who have high childlessness concerns.     

Workers' perspectives on self-directing mainstream return to work following acute mental illness: Reflections on partnerships

Objective: To examine barriers and facilitators influencing self-direction of return to mainstream work following acute mental illness.Participants: Five individuals who had attempted return to mainstream work following acute mental illness. Methods: In depth, semi-structured qualitative interviews with the five participants selected through purposive sampling. Results: The three main themes related to the workers' self-direction of their return to work experience were (a) worker self-management, (b) workers' 'personal' partnerships and (c) workplace partnerships. Conclusion: Personal and workplace partnerships are integral to supporting workers as they take ownership of their full potential and self-direct return to mainstream work.