A bayesian analysis of the mixed linear model

The mixed model is defined. The exact posterior distribution for the fixed effect vector is obtained. The exact posterior distribution for the error variance is obtained. The exact posterior mean and variance of a Bayesian estimator for the variances of random effects is also derived. All computations are non-iterative and avoid numerical integrations.     

Attachment and depression differentially influence nicotine dependence among male and female undergraduates: a preliminary study

The authors surveyed a convenience sample of 208 undergraduate students who reported that they smoked cigarettes. The primary hypothesis they tested was whether gender predicted nicotine dependence. They further tested whether depression and attachment would mediate or moderate this relationship. Hierarchical regression analyses with social desirability and smoking stage of change entered as covariates indicated that women exhibited greater nicotine dependence than men did (p < .01). Lower attachment scores fully mediated this relationship, whereas elevated depression scores moderated the relationship. These findings suggest that depression and the inability to bond with peers may promote nicotine dependence among young female students.     

The Impact of Organizational Form on Gendered Labour Markets in Engineering and Law

It is well known that occupations are differentially gendered and explanations for such gendering usually focus on structure and process in the labour market. However little is known of the fine detail of the way in which labour markets perform for particular occupations in particular local contexts. This article is based on micro-sociological research on the professional labour markets for law and engineering professionals in the city of Hobart, Australia. It addresses a discrepancy in women's participation and promotion rates in each of these professions: the proportion of women in high positions in engineering matches their educational qualification rates while that in law is considerably lower than educational qualification rates would suggest. The paper proposes that the explanation can be found in the respective organizational patterns of the two professions. Engineering is practised in large-scale bureaucratic organizations where formal rules govern recruitment and promotion, where equal opportunities legislation literally applies, and where a strict separation is maintained between public and domestic spheres. By contrast, law is practised in collegial partnerships where informal judgements govern recruitment and promotion, where the letter of equal opportunities legislation need not be applied, and where advancement depends on the subordination of the domestic to the public sphere.     

Callosal inhibition: the key to the brain code

A mechanism for interhemispheric communication is proposed based upon the assumption of homotopic callosal inhibition. The implied pattern of cortical activity in each cerebral hemisphere is shown to be the mirror-image and "photographic negative" of the contralateral pattern. Mirror-imagery is a direct consequence of (1) approximate cerebral hemispheric bilateral symmetry and (2) homotopic callosal connections. The photographic negative relationship is a direct consequence of (1) bilaterally symmetrical activation of the cortex via subcortical "attentional" mechanisms and (2) inhibition by a unilaterally established engram of an identical cortical pattern contralaterally. In language generation and understanding, excitation predominantly in the left hemisphere produces on the right inhibition of language-related neurons as well as excitation of all surrounding "contextual" neurons. The suggested dichotomy of verbal and contextual functions of the cerebral hemispheres is shown to be supported by previous findings concerned with cognition in brain-damaged patients. Unlike earlier suggestions of linguistic and paralinguistic specializations in the left and right, the mirror-image negative hypothesis is based upon an explicit physiological process rather than unspecified differences in "information processing."     

The War of the Woods: Facilitators and Impediments of Organizational Learning Processes

This study examines unfolding organizational learning processes at MacMillan Bloedel, a company which, after years of resisting stakeholder pressures for change, disengaged from the field’s dominant paradigm and developed a new solution. We elaborate the Crossan, Lane and White multi–level framework of organizational learning processes, finding support for the four feedforward learning processes they identified (intuiting, interpreting, integrating and institutionalizing), and adding two action–based learning processes: ‘attending’ and ‘experimenting’. We introduce the concept of a ‘legitimacy trap’ to describe an organization’s over–reliance on institutionalized knowledge when external challenges arise. The trapped organization rejects external challenges of its legitimacy when it perceives the sources of those challenges to be illegitimate. Feedforward learning is blocked as the organization escalates its commitment to its institutionalized interpretations and actions. Taking a grounded theory approach, we discuss how individuals attend to new stimuli and engage in intuiting about them, how groups interpret, experiment with and integrate new solutions, and how the firm validates and institutionalizes the successful solution. Facilitators and impediments of each of these learning processes are identified. Our additions to the model recognize the importance of context in organizational learning processes, and suggest how power may impact organizational learning.     

Progressive multi-state models for informatively incomplete longitudinal data

Progressive multi-state models provide a convenient framework for characterizing chronic disease processes where the states represent the degree of damage resulting from the disease. Incomplete data often arise in studies of such processes, and standard methods of analysis can lead to biased parameter estimates when observation of data is response-dependent. This paper describes a joint analysis useful for fitting progressive multi-state models to data arising in longitudinal studies in such settings. Likelihood based methods are described and parameters are shown to be identifiable. An EM algorithm is described for parameter estimation, and variance estimation is carried out using the Louis’ method. Simulation studies demonstrate that the proposed method works well in practice under a variety of settings. An application to data from a smoking prevention study illustrates the utility of the method.     

What’s the Confusion About Fusion?—Differentiating Positive and Negative Closeness in Lesbian Relationships

This study differentiated between closeness and fusion in lesbian relationships, and examined whether age, adult attachment style, social support, outness, and relationship satisfaction were associated with these variables. Participants consisted of 77 women in long-term, lesbian relationships. Overall, women who reported showing greater closeness toward their partners were more satisfied in their relationships. Age and attachment style were better predictors of closeness and fusion than were social support and outness. The theoretical implications of these findings are discussed. Findings highlight the need for therapists to distinguish between positive and negative types of closeness in lesbian relationships, and avoid pathologizing high levels of closeness in lesbian relationships simply because they may deviate from a heterosexual norm.     

Stakeholder Communication in 140 Characters or Less: A Study of Community Sport Foundations

Community sport foundations (CSFs), like other non-profit organizations, are increasingly employing social media such as Twitter to communicate their mission and activities to their diverse stakeholder groups. However, the way these CSFs utilize social media for communicating such practices remains unclear. Through a mixed-method approach of content analysis of tweets from 22 CSFs established by English professional football clubs and interviews with key individuals within these CSFs (n = 7), this study examines the extent to which CSFs’ core activities are being communicated through Twitter and identifies the strategies employed for doing so. Reflecting the target audiences CSFs are seeking to reach through Twitter and the challenges associated with communication about projects involving marginalized groups, tweets largely concern programs related to sports participation and education. The most frequently employed communication strategy is to inform, rather than interact or engage with stakeholders. However, CSFs with higher organizational capacity attempt to go beyond mere informing towards engaging with stakeholder groups that relate to their social agenda, highlighting the importance of trained and dedicated social media personnel in optimizing CSFs’ use of Twitter for communication.     

Racial and Ethnic Differences in the Prevalence of Depressive Symptoms Among U.S. Nursing Home Residents

This study aimed to examine racial and ethnic differences in significant depressive symptoms among long-term nursing home residents. We analyzed the 2014 national Minimum Data Set linked to a nursing home file and estimated multivariable logistic regressions to determine the associations of race and ethnicities with significant depressive symptoms (score ≥ 10 on the 9-item Patient Health Questionnaire [PHQ-9] scale) and whether associations were explained by resident and nursing home covariates. Stratified analyses further determined independent associations in subgroups of residents. We found that the prevalence rate of PHQ-9 scores ≥ 10 was 8.8% among non-Hispanic White residents (n = 653,031) and 7.4%, 6.9%, and 6.6% among Black (n = 97,629), Hispanic (n = 39,752), and Asian (n = 16,636) residents, respectively. The reduced likelihoods of significant depressive symptoms for minority residents compared to non-Hispanic Whites persisted after sequential adjustments for resident and nursing home covariates, as well as in stratified analyses. The persistently lower rate of significant depressive symptoms among racial and ethnic minority residents suggests that training of nursing home caregivers for culturally sensitive depression screening is needed for improved symptom recognition among minority residents.