The inverse power Lindley distribution in the presence of left-censored data

In this study, classical and Bayesian inference methods are introduced to analyze lifetime data sets in the presence of left censoring considering two generalizations of the Lindley distribution: a first generalization proposed by Ghitany et al. [Power Lindley distribution and associated inference, Comput. Statist. Data Anal. 64 (2013), pp. 20–33], denoted as a power Lindley distribution and a second generalization proposed by Sharma et al. [The inverse Lindley distribution: A stress–strength reliability model with application to head and neck cancer data, J. Ind. Prod. Eng. 32 (2015), pp. 162–173], denoted as an inverse Lindley distribution. In our approach, we have used a distribution obtained from these two generalizations denoted as an inverse power Lindley distribution. A numerical illustration is presented considering a dataset of thyroglobulin levels present in a group of individuals with differentiated cancer of thyroid.     

Embracing inclusive excellence: Asian and Asian American college students

ABSTRACT

This study aims to understand the importance of embracing and promoting inclusiveness in higher education as a path to academic excellence. As student populations become increasingly diverse and higher education faces significant challenges at home and abroad, cultural competence – understanding the specific culture, language, social, and economic status of people-, becomes more important than ever before because a sense of belonging is essential for students. This study is to re-envision diversity and practice our commitment to inclusive excellence-both preparing students with a quality learning opportunity and facilitating a sense of belonging by providing an embracing environment on campus.     

The profile of women who consult midwives in Australia

BackgroundThere is no Australian data on the characteristics of women who consult with midwives.AimTo determine the profile of women who consult midwives in Australia.MethodsThis cross-sectional research was conducted as part of the Australian Longitudinal Study on Women's Health (ALSWH). Participants were the younger (31–36 years) cohort of the ALSWH who completed a survey in 2009, and indicated that they were currently pregnant (n = 801). The main outcome measure was consultation with a midwife.FindingsOf the 801 women who indicated that they were currently pregnant at the time of the survey, 19%, 42%, and 70% of women in the first, second and third trimesters respectively had consulted with a midwife. Women were more likely to consult a midwife if they: also consulted with a hospital doctor (OR = 2.70, 95% CI: 1.66, 4.40); also consulted with a complementary and alternative medicine practitioner (OR = 1.94, 95% CI: 1.25, 3.03); were depressed (OR = 1.84, 95% CI: 1.03, 3.28); constipated (OR = 1.80, 95% CI: 1.04, 3.13); or had been diagnosed or treated for hypertension during pregnancy (OR = 2.78, 95% CI: 1.27, 6.09). Women were less likely (OR = 0.34, 95% CI: 0.21, 0.56) to consult with a midwife if they had private health insurance.ConclusionWomen were more likely to consult with midwives in conjunction with consultations with hospital doctors or complementary and alternative medicine practitioners. Women with private health insurance were less likely to consult midwives. More research is necessary to determine the implications of the lack of midwifery care for these women.     

Prevalence of DSM-IV major depression among Spanish university students

OBJECTIVE: The authors' purpose in this study was to estimate prevalence and correlates of Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV), major depressive episodes (MDEs) among Spanish university students. PARTICIPANTS AND METHODS: In October and November 2004, interviewers administered a screening tool to a sample of 554 students aged 18-34 years (65.9% women). RESULTS: The prevalence of MDEs was 8.7% (95% confidence interval = 6.5%-11.3%). The most common symptoms were depressed mood (81.3%) and altered sleep (79.2%). MDEs were more prevalent among women than men (p < .05). The mean number of previous episodes of depression among currently depressed students with previous episodes was 2.2 (SD = 1.4). Of depressed students, 0.6% had considered suicide and 0.2% had attempted suicide. CONCLUSIONS: Depression was highly prevalent among university students. The results suggest the need to develop some type of program or service for university students with the aim of preventing depression and improving their adaptation to university life.     

Culture and leadership: women in nonprofit and for-profit leadership positions within the European Union

Research has shown that women commonly hold positions of leadership within nonprofit organizations, while men typically hold the leadership positions within for-profit organizations. However, little research on women's leadership roles has been conducted within European Union countries. The purpose of this article is to examine women's leadership positions within nonprofit and for-profit organizations within the European Union and, using Hofstede's Cultural Dimensions Theory, to further investigate a potential correlation between national culture and female leadership. Fifty-one companies were examined based on type, country characteristics and gender dominance. A significant difference was found between organization type (nonprofit/for-profit) and organizational dominance (masculine/feminine). The findings suggest that the European Union has patterns of gendered leadership positions similar to patterns found previously in the USA. However, countries that were characterized as feminine had more than expected nonprofit organizations, while masculine countries had more for-profit organizations.     

Benchmarking airports from a managerial perspective

Benchmarking airports is currently popular both in the academic literature and in practice but has proved rather problematic due to the heterogeneity inherent in any reasonably sized dataset. Most studies either treat the airport production technology as a black box, or separate the terminal and airside activities, assessing them individually. In this article we analyze airports as a single unit due to the direct complementarities, thus avoiding the artificial separation of inputs. Using data envelopment analysis (DEA), we open the black box in which a network describes the production process, thus demonstrating the sequential effects that separate final from intermediate outputs, including those under partial managerial control and those that are known to be non-discretionary. To further improve the benchmarking process, we identify appropriate peers for a case study of 43 European airports over 10 years, through a restricted reference mechanism according to pre-defined characteristics. Compared to basic DEA models, the results of the proposed structure provide more meaningful benchmarks with comparable peer units and target values that are potentially achievable in the medium term. By identifying each unit's individual reference set, unique outliers influence the performance measurement less severely than occurs under basic DEA. In addition, the formulations produce an implementation path that moves the airport towards the Pareto frontier gradually, taking into account the regulatory and business environment in which the unit is located.     

Portuguese adopted adolescents' perception of attachment relationships to parents

The establishment of emotional bonds is one of the most important tasks of the adoptive family. Most research about attachment in adoption focuses on young adopted children, as opposed to adoptees in other stages of development. The present study aims at assessing the adopted adolescents' self‐perception of attachment relationships with their adoptive parents, by pairing them with a group of institutionalized adolescents and another one of adolescents in the community. One hundred sixty‐five adolescents (55 adopted, 55 in residential care, and 55 living with their birth family), aged 12 to 19, participated in this study. Data were collected using the Inventory of Parent and Peer Attachment to assess attachment relationships with parents on three dimensions: trust, communication, and alienation. The results showed that adoptees perceived their relationship with their parents in a similar way to peers in the community and presented higher results when compared to institutionalized adolescents in trust and communication and lower scores in alienation. The results highlighted the relevance of family context experiences and suggested that adoption can offer the possibility of building a secure attachment relationship, which is not the case in the context of collective care, as happens within institutionalized care.     

Meanings of lone motherhood within a broader family context

In this paper, the theoretical approach to the concept of lone motherhood is adopted from ‘new’ family sociology where families are understood to be dynamic processes constituted by webs of relationships. I analyse life stories written by lone mothers in order to examine the meanings that they give to their lone motherhood in relation to their larger family context. This approach reveals that, along with the concept ‘family’, the category ‘lone motherhood’ can be questioned. The life stories show that as with all families, the representations of ‘the lone mother family’ vary. Lone motherhood emerges less as a distinct family form and more as an experience coloured by the lone mother's position in a web of family relationships, as well as her place in her broader personal, social and historical context.     

Defining causal mediation with a longitudinal mediator and a survival outcome

In the context of causal mediation analysis, prevailing notions of direct and indirect effects are based on nested counterfactuals. These can be problematic regarding interpretation and identifiability especially when the mediator is a time-dependent process and the outcome is survival or, more generally, a time-to-event outcome. We propose and discuss an alternative definition of mediated effects that does not suffer from these problems, and is more transparent than the current alternatives. Our proposal is based on the extended graphical approach of Robins and Richardson (in: Shrout (ed) Causality and psychopathology: finding the determinants of disorders and their cures, Oxford University Press, Oxford, 2011), where treatment is decomposed into different components, or aspects, along different causal paths corresponding to real world mechanisms. This is an interesting alternative motivation for any causal mediation setting, but especially for survival outcomes. We give assumptions allowing identifiability of such alternative mediated effects leading to the familiar mediation g-formula (Robins in Math Model 7:1393, 1986); this implies that a number of available methods of estimation can be applied.