A note on the use of the shapiro- wilk test of exponentiality for complete samples

The consistency of the Shapiro-Wilk test of exponentialIty is examined. In testing repair-time data for exponentiality, the natural class of lognormal alternatives is shown to contain a subclass over which the test Is Inconsistent. A transformation of the data is recommended to alleviate the problem.     

Using Electronic Contact to Reduce Homonegative Attitudes,Emotions, and Behavioral Intentions Among Heterosexual Women and Men: A Contemporary Extension of the Contact Hypothesis

The current study experimentally examined the potential for a contemporary extension of the contact hypothesis, known as electronic contact, or E-contact, to reduce sexual prejudice, intergroup anxiety, and avoidant behavioral intentions among heterosexuals. It also extended the sexual minority contact literature by examining the role of participant and interaction partner sex as a possible boundary condition of this contact–prejudice relationship. To test our hypotheses, 140 heterosexual female and male university students were randomly allocated to interact with a homosexual or heterosexual, female or male E-contact partner, in a collaborative and text-only online interaction before completing the outcome measures. Overall, the results demonstrated that interacting online with a female, as opposed to a male, homosexual E-contact partner reduced heterosexual men’s feelings of intergroup anxiety, which in turn was associated with lower sexual prejudice and outgroup avoidance. For heterosexual women, however, E-contact did not influence the outcome variables. In the context of sexual prejudice, these results suggest that E-contact may be particularly useful as a prejudice-reduction strategy among individuals who typically require it most: heterosexual men.     

'It's More of a Production': accomplishing mothering using a mobility device

This qualitative study investigated the conditions and experiences of mothers who used wheelchairs and scooters for full-time mobility. In focused, open-ended interviews, 11 mothers of children aged 6 months to 18 years described sociospatial obstacles and facilitators that influenced how they cared for their children and homes. Results suggest that mothering with a disability consists of embodied and emplaced practices. Women often felt 'out of place' as mothers given the relationship between mothering discourse and mobility devices. Furthermore, the embeddedness of mothering in place meant that the social and material conditions of place served not only as antecedents to mothering challenges, but also structured possible solutions     

Sense of Belonging to Specific Communities and Depressive Symptoms Among Australian Gay Men

Sense of belonging to the general and broader gay communities has been shown to be beneficial for gay men’s mental health. This research investigated the interrelations between sense of belonging to three forms of gay community (the broader gay community, gay groups, and gay friends), sense of belonging to the general community, and depressive symptoms by examining a path model. A community sample of 177 gay men, aged 18 to 79 years, completed the Sense of Belonging Instrument–Psychological subscale, the Centre for Epidemiological Studies–Depression Scale, and the Sense of Belonging within Gay Communities Scale. The model provided excellent fit to the data in which sense of belonging to the general community mediated the relationships between a sense of belonging to gay groups and with gay friends and depressive symptoms. Results imply that enhancing gay men’s sense of belonging to gay groups and with gay friends is likely to be associated with fewer depressive symptoms, by virtue of their enhanced sense of belonging to the general community.     

Sexual Development in Adolescence: An Examination of Genetic and Environmental Influences

Sexual development entails many experiences and is a major feature of adolescence. Most relevant behavioral genetic studies, however, focus primarily on sexual behaviors associated with health risks. We took a more normative, developmental perspective by examining genetic and environmental influences on five sexual behaviors ranging from dating to pregnancy in middle (M_age = 14.90 years) and late adolescence (M_age = 17.85 years) in a sample of twins (N = 3,762). Overall, behaviors that are more common and socially sanctioned (e.g., dating) were more heritable than behaviors that are less common and socially acceptable (e.g., sexual intercourse). That the etiology of different sexual behaviors is tied to their normativeness highlights the importance of considering the broader developmental context when studying sexual development.     

Simultaneous determination of production lot size and process parameters under process deterioration and process breakdown

The purpose of this study is to combine production-inventory management with process-quality design for determining production lot size and process parameters under the possibility of process deterioration and breakdown. The total cost of such an integrated model includes: the combined setup cost (production setup and process resetting), the costs of quality loss, tolerance and mean costs for processes established, a penalty cost for process breakdown and carrying costs for cumulated inventory. The quadratic quality loss function is introduced to assess quality loss within the system. Decision variables include the initial setting (process mean) and process tolerance for process parameters determination, and production lot size for production-inventory management. The cycle time for production-inventory management is assumed to be the same as the resetting cycle for the new process-quality system. The contribution of this study lies in its development of an integrated model that enables process parameters, production lot size, and cycle time to be determined concurrently for quality and economic considerations, and at an earlier time in the process design and production management stage. An example is presented to demonstrate the proposed model.     

Experiential Wellbeing Data from the American Time Use Survey: Comparisons with Other Methods and Analytic Illustrations with Age and Income

There has been a recent upsurge of interest in self-reported measures of wellbeing by official statisticians and by researchers in the social sciences. This paper considers data from a wellbeing supplement to the American Time Use Survey (ATUS), which parsed the previous day into episodes. Respondents provided ratings of five experiential wellbeing adjectives (happiness, stress, tiredness, sadness, and pain) for each of three randomly selected episodes. Because the ATUS wellbeing module has not received very much attention, in this paper we provide the reader with details about the features of these data and our approach to analyzing the data (e.g., weighting considerations), and then illustrate the applicability of these data to current issues. Specifically, we examine the association of age and income with all of the experiential wellbeing adjective in the ATUS. Results from the ATUS wellbeing module were broadly consistent with earlier findings on age, but did not confirm all earlier findings between income and wellbeing. We conclude that the ATUS, with its measurement of time use, specific activities, and hedonic experience in a nationally representative survey, offers a unique opportunity to incorporate time use into the burgeoning field of wellbeing research.