Stress–strength models with more than two states under exponential distribution

In the stress–strength models, analysis is based on the reliability of the system where the system is either in operational state or in failure state. Ery?lmaz (2011 Ery?lmaz, S. (2011). A new perspective to stress–strength models. Ann. Inst. Stat. Math. 63(1):101–115.[Crossref], [Web of Science ®] , [Google Scholar]) introduced the stress–strength reliability in a different framework assigning more than two states to the system depending on the difference between strength and stress values. Unlike Ery?lmaz (2011 Ery?lmaz, S. (2011). A new perspective to stress–strength models. Ann. Inst. Stat. Math. 63(1):101–115.[Crossref], [Web of Science ®] , [Google Scholar]), the present article deals with the ratio of the strength and stress values when the stress and strength follow independent exponential distributions. This article presents in detail the estimation aspect of the multistate stress–strength reliability function.     

Stress−strength reliability with general form distributions

In this article, we present characterizations, associated with the stress?strength reliability, of distributions with some general exponential and general inverse exponential forms. We obtain a general form for stress?strength reliability, when the distributions of the stress and the strength are non identical and independently distributed with either form. We obtain different point and interval estimators of stress?strength reliability. The theoretical results obtained can be directly applied whenever the distributions of the stress and the strength possess the forms discussed. A simulation study is carried out showing satisfactory performance of the estimators obtained. Moreover, a real data example is presented.     

Weighted likelihood based inference for P(X < Y)

This contribution deals with the statistical problem of evaluating the stress–strength reliability parameter R = P(X < Y), when both stress and strength data are prone to contamination. Standard likelihood inference can be badly affected by mild data inadequacies, that often occur in the form of several outliers. Then, robust tools are recommended. Here, inference relies on the weighted likelihood methodology. This approach has the advantage to lead to robust estimators, tests, and confidence intervals that share the main asymptotic properties of their classical counterparts. The accuracy of the proposed methodology is illustrated both by numerical studies and real-data applications.     

Caregiver stressors and depressive symptoms among older husbands and wives in the United States

Framed by Pearlin’s Stress Process Model, this study prospectively examines the effects of primary stress factors reflecting the duration, amount, and type of care on the depressive symptoms of spousal caregivers over a2-year period, and whether the effects of stressors differ between husbands and wives. Data are from the 2004 and 2006 waves of the Health and Retirement Study and we included community-dwelling respondents providing activities of daily life (ADL) and/or instrumental activities of daily life (IADL) help to their spouses/partners (N = 774). Results from multivariate regression models indicate that none of the primary stressors were associated with depressive symptoms. However, wives providing only personal care had significantly more depressive symptoms than wives providing only instrumental care, while husbands providing different types of care showed no such differences. To illuminate strategies for reducing the higher distress experienced by wife caregivers engaged in personal care assistance, further studies are needed incorporating couples’ relational dynamics and gendered experiences in personal care.     

Leadership and stress: A meta-analytic review

Stress has been implicated as an important determinant of leadership functioning. Conversely, the behavior of leaders has long been argued to be a major factor in determining the stress levels of followers. Yet despite the widespread acknowledgement that stress and leadership are linked, there has been no systematic attempt to organize and summarize these literatures. In the present, we meta-analytically review the relationship between three leadership constructs (transformational leadership, leader-member exchange, and abusive supervision) and stress and burnout. Our analyses confirm that leader stress influences leader behavior and that leadership behaviors and leader-follower relationships are significant determinants of stress and burnout in subordinates. We build on these results to suggest new avenues for research in this domain as well as discussing how these results can inform practice with regards to leader development.     

现代企业员工的完美主义倾向与工作应激的相关性分析

现代企业员工感受到的工作应激强度受到其个性特征(如完美主义性格倾向)的影响,而完美主义者在工作中的种种负面表现(如过分担心犯错,不能按时完成任务,容易情绪失控等等)也可能在外界压力的作用下被放大.对完美主义倾向和工作应激的相关性进行分析,揭示两者总体及各个维度之间的相互联系和作用,有利于企业塑造和谐氛围,提高现代企业员工满意度和经营绩效.     

The Demands-Control-Support model, locus of control and job dissatisfaction: a longitudinal study

The Job-Demands-Control model (Karasek, 1979) has been widely studied in the job stress field, but the results obtained are frequently contradictory. Therefore, some investigations have expanded the model by including social support and personality characteristics such as locus of control. However, results obtained with these elaborated models have not been conclusive either. The present study sets out to integrate both types of expansions by simultaneously including social support at work and the employee's locus of control in a longitudinal multi-national study among 542 administrative personnel from Belgium, England, Spain, Italy and Israel. Hierarchical moderated multiple regression showed a significant 4-way interaction term (Demands ×Control ×Social support ×Locus of control) on the change in job dissatisfaction. This effect is qualified by the interaction between job demands and control only for an internal locus of control with high social support. Contrary to the prediction of the JDC model, which posits that high control has a buffering effect on job dissatisfaction, the study result indicates a damaging effect of excess control (perceived job control and high internal locus of control), specifically in high social support situations.     

Burnout, job stress and violent behaviour among Dutch police officers

Much has been published on burnout in the human services. However, despite the extensive literature on job stress in policing, burnout in police officers has rarely been studied. The present study examined stressors in police work, focusing specifically on the lack of reciprocity that officers experience in relations with civilians, colleagues and the police service. It also investigated the relationship between burnout and the attitudes of officers towards violence, as well as to their own use of violence. Dutch police officers (N = 358) completed a self-report questionnaire. The results showed that: (1) organizational stressors were more prevalent than task-related stressors; (2) compared to other service jobs, police officers report a particular profile on the three scales of the Maslach Burnout Inventory (MBI)?a relatively low level of emotional exhaustion,an average level of depersonalization, and a high level of personal accomplishment; (3) burnout is associated with a lack of reciprocity between investments and outcomes in the relations that officers have with citizens, colleagues and their organization; and (4) burnout is positively related to attitudes towards use of violence and the use of violence during the officers' duty.     

Factors Affecting Attachment in International Adoptees at 6 Months Post Adoption

This pilot study examined the effect of five child and maternal factors on the attachment security of international adoptees at 6 months post adoption. Results from the sample of 22 adoptive mother-infant dyads showed that age at adoption, developmental status, length and quality of preadoption care, and maternal attachment representations were not significant predictors of child attachment status. The number of preadoption placements and the child's stress level did significantly predict attachment status, accounting for approximately 40% of the variance in attachment security. Number of preadoption placements uniquely contributed 14% of that variance (p = .007) while stress level uniquely contributed 12% (p = .01). Children who had fewer preadoption placements had higher attachment security; similarly, children who had lower stress levels had higher attachment security. Results suggest that consistency of preadoption care was more important than its length or quality. Further, the relationship between stress level and attachment security raises the possibility that a lower stress level functions as a protective factor for the developing attachment with the adoptive mother.     

Gratitude and Adolescent Athletes’ Well-Being

Two cross-sectional studies were conducted to examine the relationships between gratitude and athletes’ well-being. Study 1 examines the relationship between dispositional gratitude and well-being, while Study 2 investigates the relationship between sport-domain gratitude and well-being. In Study 1, 169 Taiwanese senior high school athletes (M = 16.43, SD = 0.7 years) were administered the Gratitude Questionnaire (GQ; McCullough et al. 2002, Journal of Personality and Social Psychology, 82(1), 112–127), Team Satisfaction Scale (Walling et al. 1993, Journal of Sport & Exercise Psychology, 15, 172–183), Satisfaction with Life Scale (SWLS; Diener et al. 1985, Journal of Personality Assessment, 49, 71–75), and the Athlete Burnout Questionnaire (ABQ; Raedeke and Smith, 2001, Journal of Sport & Exercise Psychology, 23(4), 281–306). In Study 2, a separate sample of 265 adolescent athletes (M = 16.47 years, SD = 0.7) were administered the modified Sport-domain GQ, Team Satisfaction Scale, and ABQ. Study 1 results showed that dispositional gratitude positively predicts team satisfaction and life satisfaction, and negatively predicts athlete burnout. Findings from Study 2 revealed that sport-domain gratitude positively predicts team satisfaction and negatively predicts athlete burnout. A stronger gratitude and well-being relationship was observed in Study 2. This research provides the initial verification that gratitude and adolescent athletes’ well-being are related. Possible mechanism of this relation, limitations, and practical implications are discussed.