Estimation of a multivariate normal covariance matrix under a certain structure

We consider the estimation of Σ of the p-dimensional normal distribution N_p (0, Σ) when Σ?=?θ₀ I_p ?+?θ₁ aa′, where a is an unknown p-dimensional normalized vector and θ₀?>?0, θ₁?≥?0 are also unknown. First, we derive the restricted maximum likelihood (REML) estimator. Second, we propose a new estimator, which dominates the REML estimator with respect to Stein's loss function. Finally, we carry out Monte Carlo simulation to investigate the magnitude of the new estimator's superiority.     

STICKY PRICES: A NEW MONETARIST APPROACH

Why do some sellers set nominal prices that apparently do not respond to changes in the aggregate price level? In many models, prices are sticky by assumption; here it is a result. We use search theory, with two consequences: prices are set in dollars, since money is the medium of exchange; and equilibrium implies a nondegenerate price distribution. When the money supply increases, some sellers may keep prices constant, earning less per unit but making it up on volume so profit stays constant. The calibrated model matches price‐change data well. But, in contrast to typical sticky‐price models, money is neutral.     

A systematic review of studies on ethnic minority youth development in Hong Kong: an application of the ecological framework

Abstract

Ethnic minority young people play a significant role in the socio-economic growth of an ageing society with a decreasing fertility rate. The successful social integration of individuals with diverse cultural backgrounds within a society is a core value of the social work profession. This study examines the understanding of ethnic minority youth development in Hong Kong using a systematic review methodology. Risk prevention and positive promotion factors were identified using Bronfenbrenner’s ecological framework. Articles were searched through multiple databases in English, and 36 academic articles were reviewed. These studies mainly examined the risks of academic failure of these students in Hong Kong while few focused on the positive directions of multidimensional youth development. Future social work research and practice should examine positive youth development for ethnic minorities which can inform social work practice in Hong Kong and within other East Asian traditionally ethnically homogeneous societies undergoing significant changes in ethnic diversity.     

The mental health of children who witness domestic violence

There is now considerable evidence that witnessing domestic violence can have adverse consequences for children. Our aim is to present the socio-demographic correlates of children witnessing domestic violence and its association with childhood mental disorders. The biographic, socio-demographic and socio-economic characteristics of 7865 children and their families and measures of traumatic events including witnessing domestic violence were entered into a logistic regression analysis to establish the strength of association between witnessing severe domestic violence and childhood disorders. About 4% of children had witnessed severe domestic violence according to parent reports. Factors independently associated with a greater likelihood of a child witnessing domestic violence were: older age group, mixed ethnicity, physical disorder, several children in family, divorced parents, living in rented accommodation, poor neighbourhoods, the mother's emotional state and family dysfunction. Witnessing severe domestic violence almost tripled the likelihood of children having conduct disorder but was not independently associated with emotional disorders. There is a growing need for more research on the consequences of witnessing domestic violence to increase the awareness of social workers and policy-makers to identify the needs of children who witness domestic violence.     

Incomplete Resistance

The purpose of this essay is to examine the contradictions between narrative and filmic technique that result in conflicting messages in Karim Aïnouz's film O Céu de Suely. Although the film demonstrates the hardship and isolation that drive its northeastern Brazilian protagonist to raffle herself in order to buy a bus ticket out of town, it simultaneously sensualizes and encourages the audience to take pleasure in the female body by displaying it erotically. I call this tension between message and form incomplete resistance. The questions of how prostitution relates to patriarchy and the success of the protagonist's scheme in selling sex while refusing the label of prostitute are central to this analysis.     

Defining urban,suburban, and rural: a method to link perceptual definitions with geospatial measures of urbanization in central and eastern Massachusetts

Developing greater understandings of socio-ecological relationships across urbanizing areas is increasingly recognized as important for the conservation and management of natural resources in a variety of development contexts. Efforts to do so have been hindered by a lack of consistent measures of urbanization and the challenge of integrating socio-cultural characteristics into definitions of urban. We present a novel method for linking perceptual definitions of urban, suburban, and rural to geospatial characteristics and demonstrate how the method can be used to map urban, suburban, and rural areas at multiple scales in central and eastern Massachusetts. Our method can facilitate comparative approaches to urban ecology, be used to scale up socio-ecological studies, and inform conservation research and practice in urbanizing areas.     

Reciprocal Peer Dislike and Psychosocial Adjustment in Childhood

Reciprocal peer dislike was examined as a predictor of school adjustment and social relationship quality. One hundred and fifty‐one [69 male and 74 female, mean (M)_age = 9.53, standard deviation (SD)_age = .63 years] children completed measures of school liking, loneliness, and friendship quality twice over three months. From ratings of the amount of time participants liked to spend with individual classmates, social network analyses were used to determine reciprocal peer dislike. Curvilinear regression analyses revealed that reciprocal peer dislike at Time 1 predicted changes in the children's loneliness and friendship quality assessed as help, security, and closeness over three months. The findings support the conclusion that reciprocal peer dislike predicts aspects of school adjustment and social relationship qualities.     

What has happened to Australia's public housing? Thirty years of policy and outcomes, 1981 to 2011

This paper uses the release of the 2011 Australian Bureau of Statistics (ABS) census results and other recent and historical data sets to explore how Australian public housing has changed over the period 1981–2011. It summarises the contextual factors that have influenced housing provision and consumption in Australia over the past thirty years. The overall supply trends by tenure for Australia and each capital city are set out, followed by analysis of the demographics of public housing tenants, including age, household type, income, mobility, and workforce participation. Issues identified in the paper include insufficient stock and increasingly targeted households, representing a social and financial problem for housing agencies. The current stock is ill‐adapted to tenants' needs; if housing agencies re‐profile the housing to meet such needs, then they risk creating inflexible stock. The paper concludes with reflection on the future of public housing in Australia.     

Fathers who use domestic violence: Organisational capacity building and practice development

It is well established in the literature that fathers who use violence harm women and children. Statutory child protection workers and other human service professionals now face strong injunctions to work with these men. However, insufficient attention has been given to considering the processes for intervening with fathers who use violence and the organisational context to support workers in refocusing their practice. Workers lack clear guidance, and organisations lack specific understandings of how to support workers in this complex area of practice. Australian research used co‐design with professionals in Communities of Practice supported by the Safe & Together Institute to explore the organisational context required to work with fathers who use violence. This paper presents findings of qualitative data gathered from surveys, focus groups, and ethnographic notes of 30 Community of Practice sessions. Working together, practitioners and researchers identified four essential elements to support organisational development and improve practice: leadership by senior managers; recognition that domestic violence work needs to strengthen collaborative working; extensive training, supervising, and coaching; and enhanced worker safety. Worker perspectives are critical in developing practice principles and identifying organisational mechanisms that support practitioners to work safely and effectively with fathers who use violence.