Another approach to inverting a covariance matrix when data are unbalanced

Searle and Rudan (1973) derive the inverse of a covariance matrix for unbalanced data in ANOVA. Their expression is highly complicated. This paper presents an alternative derivation and shows how unbalancedness enters in.     

Longitudinal Effects of Adolescent Abuse on Relationship Quality and Posttraumatic Stress Symptoms in Mother–Adolescent Dyads

The current study examined dyadic reports of mother–adolescent relationship quality (RQ) as a mechanism by which emotional, physical, and sexual abuse affect posttraumatic stress symptoms (PTSS) over time from a family systems perspective. We used three waves of data from the Longitudinal Studies of Child Abuse and Neglect (LONGSCAN), including 321 mother–adolescent dyads observed when adolescents were approximately 12, 14, and 16 years old. We used an extended version of the actor–partner interdependence mediation model to analyze the effect of emotional, physical, and sexual abuse on adolescents' PTSS through dyadic reports of mother–adolescent RQ. Results yielded significant indirect effects between sexual and emotional abuse, but not physical abuse, and PTSS 4 years later through adolescent perceptions of RQ. Maternal perceptions of RQ were not directly associated with adolescents' PTSS; however, maternal perceptions of RQ positively contributed to future adolescent perceptions of RQ. Clinical implications are discussed.     

Job design and levels of physical and mental strain among Australian prison officers

Abstract

Over the past 15 years much has been made of the moderating influence of job discretion and support in occupations that are perceived to be high in demands. Such an effect seems to be most prevalent when subject populations are large and heterogeneous. One aim of this study was to examine the influence of subjective perceptions of these variables on strain reactions among a group of relatively homogeneous workers such as, in the present study, prison officers (n = 274). A second aim was to extend previous research and examine the joint influence of negative affectivity and perceptions of demands, discretion, and support on mental and physical well-being. It was hypothesized that those high in negative affect would be particularly strained by jobs perceived as being demanding. The hypothesized relationship between job demands, discretion and support were found to be weak and at times inconsistent. Social support, in particular, was found to have both positive and negative consequences for different aspects of well-being. Those high in negative affect were in general found to suffer lower mental well-being. More importantly, the interactive effect of negative affectivity and job demands was found to significantly predict the majority of the dependent variables used in this study. The valences of these relationships were inconsistent and are interpreted in light of Warr's (1987) vitamin model of stress.

There are several conclusions that can be drawn from the present study. Negative affectivity appears to have a truly interactive effect with job components, job demands in particular, to influence a range of variables relating to physical and mental health as well a job-related attitudes. The nature of these effects, however, suggests a dissociation in the ways that different independent variables influence a range of indices of well-being and affect. This result requires further investigation since there are important theoretical implications which will follow if the data are replicable.

In order to examine such complex effects, in addition to the need for more longitudinal studies, it is also important that standardized measures of job components are developed so that levels of stress exposure can be equated and their impact assessed across organizational settings.

Finally, the data reported in this study suggest that some effective stress management may be undertaken by adopting selection strategies which take into consideration individual characteristics. In view of the fact that individual stress management programmes are of unproven benefit (Murphy 1986, 1988) such an approach is recommended especially for those organizations which are highly constrained in the services that must be performed.     

Pro‐family Organizations in Calgary, 1998: Beliefs,Interconnections and Allies*

Dans cet article, nous comparons les convictions des différents groupes pro‐famille de Calgary et nous préscntons la structure des liens qui unissent ces groupes. Les données, recueillies en 1998, proviennent de documents et d'entretiens semi‐structurés avec les chefs de file de ces groupes. Nous abordons ici trois problèmes de recherche. Tout d'abord, nous examinons la teneur des relations entre groupes pro‐famille et pro‐vie. Tous les groupes pro‐famille, même ceux qui se prononcent résolument contre l'avortement, se dis‐tinguent des groupes pro‐vie sur le plan tant organisational que politique. Ensuite, nous nous penchons sur le rôle des croyances chré‐tiennes au sein du mouvement. Nous affirmons que, bien que les groupes chrétiens aient été dominants en 1998, la promotion, de la famille hétérosexuelle nucléaire, et non les questions de doctrine, a été fondamentale pour le mouvement. Enfin, nous examinons si le mouvement s'est scindé entre socioconservateurs et centristes, les centristes étant peu représentatifs en 1998. En outre, l'un des groupes présentant un profil centriste, la National Foundation for Family Research and Education, a tout fait pour légitimer du point de vue scientifique les arguments moraux des socioconservateurs en faveur de la famille. En conclusion, nous soutenons que le mouvement pro‐famille à Calgary s'est éloigné de sa vocation initiale de contre‐mouvement antiféministe. Dans l'avenir, la popularité du mouvement pro‐famille au Canada dépendra peut‐être des valeurs postféministes qu'il affichera. This paper presents a comparative study of the beliefs of pro‐family organizations in Calgary and a structural mapping of organizational ties. Data were gathered in 1998 from documents and semi‐structured interviews with group leaders. Three research problems are addressed. The first concerns the closeness of the relationship between pro‐family and pro‐life groups. We find that all pro‐family groups, even those with strong anti‐abortion convictions, were organizationally and politically distinctive from pro‐life groups. The second problem considers the role of Christian beliefs in the movement. We ascertain that although Christian groups were dominant in 1998, promotion of the heterosexual nuclear family, not doctrinal issues, was fundamental to the movement. The third problem concerns whether the movement was bifurcated between social conservative and centrist segments. The centrist segment was quite weak in 1998. Furthermore, one of the groups with a centrist persona, the National Foundation for Family Research and Education, strove to supply scientific legitimation for social conservatives' moral claims about the family. In conclusion, the article argues that the pro‐family movement in Calgary has broken free of its initial phase as an anti‐feminist countermovement and suggests that the future popularity of pro‐family advocacy in Canada will be proportional to the degree that it is couched in a post‐feminist framework.     

Institutions matter: The case of Vietnam

The paper investigates institutional reforms in Vietnam and their impact on the economic performance of firms. Using the provincial competitiveness index 2006 (PCI06) and firm-level data in Vietnam in 2005, the results show that provincial competitiveness is economically and statistically significant in explaining cross-province differences in firm performance. We find that a 1% point improvement in government practice could increase the daily value-added of an average firm by an amount equivalent to nearly three times per capita GDP per day. The results show that an improvement in providing market information, more secure land tenure and labor training assistance has a positive effect on firm performance. By contrast, weaknesses in the judiciary system and administrative reforms impede growth of non-state firms. The findings indicate that governance is an important obstacle to the development of the non-state sector in Vietnam.     

Adolescents' Peer Crowd Identification in the Netherlands: Structure and Associations with Problem Behaviors

The present paper examined the underlying structure of Dutch adolescents' peer crowd identification and its relations with delinquency, aggression, depression, and anxiety. Questionnaire data were gathered from 2,334 adolescents between ages 12 and 19. Exploratory and confirmatory factor analyses revealed four clearly interpretable crowd‐identification dimensions: Alternative, Urban, Conventional, and Achievement Oriented. Identification with the Alternative and Urban dimensions was found to be positively related to depression, delinquency, and aggression. With regard to the Urban dimension, also a positive association was found with anxiety. Identification with the Conventional‐ and Achievement Oriented dimensions was found to be negatively related to delinquency. A negative associations was also found between the Achievement Oriented dimension and aggression. Roughly the same pattern of associations was found for boys and girls, and younger and older adolescents. Our results generally confirm findings from studies relating adolescent crowd identification to adjustment performed in the United States and Australia.     

Assessing small community groups

Many community groups in the UK do micro-project work to help families and young people in low-income neighbourhoods. This paper establishes a common set of criteria for assessing the effectiveness of small community groups and uses these as basis for developing an evaluation tool for community groups and those working with them. It draws on the literature to identify those factors that are seen to be important to the functioning of community groups, where necessary adapting these to smaller groups. These criteria are then ‘tested’ on a small number of community groups across the UK, using a participative approach and questionnaire to explore these issues with each group. Our framework appears to capture all the key aspects of the groups we visited, although some of the assessment criteria need to be interpreted carefully, helping to refine our own understanding of what makes a good community group. This approach is a useful way for community groups to identify their own strengths and weaknesses and, if developed further, has potential applications in the evaluation of capacity-building schemes.     

The Psychology of Enfranchisement: Engaging and Fostering Inclusion of Members through Voting and Decision-Making Procedures

Democratic systems have many advantages. They elicit perceptions of appropriateness and legitimacy, they engage the psychological investment and commitment of those participating in the system and invite the voluntary cooperation of these persons. We argue that these advantages are conferred in large part through two features of democratic institutions and societies: the participative nature of procedures used to elect leaders, and the fairness of decision-making procedures used by these leaders once in power. In particular, we emphasize the capacity of these procedures to engage community members and foster their inclusion, because they convey that members' concerns are taken seriously and that they are valued by the group that developed and employed those procedures, as well as by the leaders that utilize them. Implications for creating a sense of social inclusion in members of the population, and for encouraging public confidence among those who feel marginalized, in climates of distrust, and during times of crisis are discussed.