On a nonparametric test for the mixed-model

Nonparametric tests for the null hypothesis of no treatment effect in the mixed-model experiment which involves n randomly chosen subjects who respond once to each of ρ distinct treatments have been developed by Koch and Sen (1968), These tests were based on the assumption of compound symmetry of the error vectors and on the weaker assumption of diagonal symmetry of the error vectors. This paper considers an alternative (permutationally) distribution-free test under this latter assumption. The new test follows the same type of distribution theory as those in Koch and Sen, but utilizes the inherent invariance structure in a more visable and direct way.     

The size-density hypothesis in Great Britain: Analysis of a deviant case

Recent studies have found size of territorial units to vary inversely with population density, the only exception to this regularity being Great Britain, where size and density were found to be unrelated. The present research accounts for this anomaly by demonstrating Britain's historical conformity to the size-density relation. The size-density hypothesis is further supported by direct test, made possible by a recent reorganization of british counties. Results show that reorganization has restored the expected inverse relation between size and density and has restructured the size and density of counties in a manner precisely specified by underlying theory.     

The Ranges of Limiting Values of Some Partial Correlations under Conditional Independence

Pearson's partial correlation, Kendall's partial tau, and a partial correlation based on Spearman's rho need not be consistent estimators of zero under conditional independence. The ranges of possible limiting values of these correlations are computed under multivariate normality and lognormality. Students should exercise caution when interpreting these partial correlations as a measure of conditional independence.     

Personalized Neural Networks Underlie Individual Differences in Ethnic Identity Exploration and Resolution

This study examined how ethnic identity relates to large-scale brain networks implicated in social interactions, social cognition, self-definition, and cognitive control. Group Iterative Multiple Model Estimation (GIMME) was used to create sparse, person-specific networks among the default mode and frontoparietal resting-state networks in a diverse sample of 104 youths aged 17–21. Links between neural density (i.e., number of connections within and between these networks) and ethnic identity exploration and resolution were evaluated in the full sample. Ethnic identity resolution was positively related to frontoparietal network density, suggesting that having clarity about one’s ethnic group membership is associated with brain network organization reflecting cognitive control. These findings help fill a critical knowledge gap about the neural underpinnings of ethnic identity.     

Family Capital: Implications for Interventions with Families

Social capital has been extensively discussed in the literature as building blocks that individuals and communities utilize to leverage system resources. Similarly, some families also create capital, which can enable members of the family, such as children, to successfully negotiate the outside world. Families in poverty confront serious challenges in developing positive family capital, because of lack of resources. For those families that are successful in developing positive family capital, family capital can help to create positive outcomes for family interactions. Thus, family capital can provide information about opportunities, exert influence on agents who make decisions involving the actor, provide social credentials that indicate a connection to a social network, and reinforce the actor's identity and recognition, which maintains access and entitlement to these social resources.     

Characterizing Mother’s Dating After Divorce

Mothers dating after divorce is a dynamic process, where not all mothers date the same way after divorce. However, few studies have examined the different ways that mothers date after divorce, which should influence maternal well-being, risk behaviors, and the quality of their relationships. This study characterizes four different approaches to mothers’ repartnering (referred to as repartnering histories): no dating, dating one partner monogamously, dating multiple partners serially, and dating multiple partners simultaneously. Each repartnering history is characterized by demographic variables, relationship quality, and maternal well-being. Implications of the study are discussed.     

The National Health Service — Can it Survive?

The National Health Service is valuable. It is also expensive. Its promise of universal health care, free to all at the point of delivery, is a source of pride and some comfort, and is also perhaps the greatest achievement of the welfare state. But with demands on it rising, and a population that lives longer into expensive old age, can it possibly be sustained? Should there be rationing? Must the funding be changed? Nigel Edwards examines the dilemmas.     

AN ETHNOGRAPHY OF COUPLE AND THERAPIST EXPERIENCES IN REFLECTING TEAM PRACTICE

Couple and therapist perspectives about the use and process of reflecting team practice were analyzed using ethnographic research. A domain analysis was performed on postession interviews from both couples and therapists, and on field notes from each therapist. Seven couples and five therapists were interviewed at least twice over a 4-month period concerning their reactions to and perceptions of reflecting team practice. Six domains concerning reflecting team practice emerged from the analysis: (a)benefits of its use, (b) effects of gender, (c)recommended use, (d) contraindicated use, (e) the importance of creating spatial separateness between couple and team members, and (f) sequences of communication between the couple and team members that elicit change. The latter two domains described the process of reflecting team practice (i.e., steps in how it is used and how it is implemented). The role of ethnog rahy in reflecting team practice and in family therapy research is discussed.     

Deforestation and the Environmental Kuznets Curve: A Cross-National Investigation of Intervening Mechanisms

Objective . We draw on ecological modernization theory and international political economy arguments to examine the sources of an environmental Kuznets curve (or EKC) that produces an inverted U-shaped rate of deforestation relative to economic development. Method . We use ordinary least squares regression with White's (1978) correction for possible heteroskedasticity to examine the rate of deforestation (1980–1995) in less developed countries. Results . Net of controls for initial forest stock and the quality of deforestation estimates, we find strong evidence for an EKC driven by (1) agglomeration effects linked to the level of urbanization, (2) rural-to-urban migration that partially offsets rural population pressure, (3) the growth of services-dominated urban economies, and (4) strong democratic states. We find little evidence that foreign debt or export dependence influence the deforestation rate. Conclusions . Although deforestation continues to pose pressing and potentially irreversible environmental risks, there is evidence of self-corrective ecological and modernization processes inherent in development that act to mitigate these risks.     

Managing human resource shortages in a unionized setting: Best practices in air traffic control

Human resource shortages require effective human resource management (HRM). Findings from research about ongoing labor shortages in air traffic control (ATC) are used to build a preliminary theory of appropriate HRM responses. Our international sample of major ATC agencies generally developed a set of best HRM practices to attract, motivate, and retain human assets. Key factors included (1) cultural and institutional norms, (2) technological change, (3) union responses, and (4) organizational form and structure (e.g., civil service versus commercial firms). While ATC’s rare human aptitudes, lengthy training to develop firm-specific human capital, and lifelong employment may limit the preliminary theory’s general applicability, crucial lessons emerge about human resource planning. This research was conducted with the support of the Social Sciences and Humanities Research Council, the Rice Fellowship, the Ziegler Fellowship, and the Center for International Business Studies at the University of Alberta. We are indebted to the individuals interviewed.