Decomposition of multivariate utility functions in non-additive expected utility theory

In expected utility many results have been derived that give necessary and/or sufficient conditions for a multivariate utility function to be decomposable into lower-dimensional functions. In particular, multilinear, multiplicative and additive decompositions have been widely discussed. These utility functions can be more easily assessed in practical situations. In this paper we present a theory of decomposition in the context of nonadditive expected utility such as anticipated utility or Choquet expected utility. We show that many of the results used in conventional expected utility carry over to these more general frameworks. If preferences over lotteries depend only on the marginal probability distributions, then in expected utility the utility function is additively decomposable. We show that in anticipated utility the marginality condition implies not only that the utility function is additively decomposable but also that the distortion function is the identity function. We further demonstrate that a decision maker who is bivariate risk neutral has a utility function that is additively decomposable and a distortion function q for which q(½) = ½.     

Targets of attack and defense in play-fighting of the Djungarian hamster Phodopus campbelli: Links to fighting and sex

Analysis of the body targets attacked and defended during play-fighting by juvenile Djungarian hamsters Phodopus campbelli revealed that about 70% of all attacks were directed at the mouth. If successfully contacted, the mouth was briefly licked and nuzzled. The remaining playful attacks were gentle bites directed at the rump, and to a lesser extent, the top of the head. During serious fighting the top of the head and the rump are targets of attack, whereas the mouth is not. Licking and nuzzling the mouth was found to be a behavior performed by adult males at the beginning of sexual encounters. Therefore, play-fighting in juvenile hamsters cannot be thought of merely as a form of “mock fighting” since the principal target is seemingly sexual, not agonistic. The data also show that of the sexual body targets contacted, adult females are more likely to defend the mouth. In this way it is suggested that targets attacked and defended during juvenile play-fighting are derived from adult contexts in which such targets are defended. This hypothesis accounts for the prevalence of agonistic targets in the play-fighting of many species, and may provide a rationale for classifying those amicable targets that are competed for during play-fighting.     

When is the Wilcoxon–Mann–Whitney procedure a test of location? Implications for effect-size measures

The Wilcoxon–Mann–Whitney procedure is invariant under monotone transformations but its use as a test of location or shift is said not to be so. It tests location only under the shift model, the assumption of parallel cumulative distribution functions (cdfs). We show that infinitely many monotone transformations of the measured variable produce parallel cdfs, so long as the original cdfs intersect nowhere or everywhere. Thus there are infinitely many effect sizes measured as shifts of medians, invalidating the notion that there is one true shift parameter and thereby rendering any single estimate dubious. Measuring effect size using the probability of superiority alleviates this difficulty.     

Readers and service commissioners require clear financial disclosures: Comment on innovation,research integrity,and change: A conflict of interest management framework for program developers (Sanders et al., 2019)

Sanders et al.'s proposal for a management framework for conflicting interests among program developers is very welcome. The underlying principles of such a framework must nevertheless prioritise the need for researchers and commissioners of services to make objective assessments of the impact of interventions reported in journal articles. This is particularly important in the field of randomised trials which may influence public sector expenditure. Using a strict definition derived from known financial conflict of interest, we have demonstrated that child-based effect sizes are much lower for independent studies than for studies with developer involvement. On this basis, we propose that journals publishing evaluations of psychosocial interventions should agree a standardised format for declarations of conflicts of interest based on that recommended by the International Committee of Medical Journal Editors.     

Misunderstandings and omissions in textbook accounts of effect sizes

There have been frequent attempts in psychology to reduce the reliance on null hypothesis significance testing (NHST) as the criterion for establishing the importance of results. Many authorities now recommend the reporting of effect sizes (ESs) as a supplement or alternative to NHST. However, there is extensive specialist literature highlighting problems associated with the use and interpretation of ESs. A review of the coverage of ESs in over 100 textbooks on statistical analysis in behavioural science revealed widespread neglect of ESs and the relevant critical issues that have widespread coverage in the more specialist literature. For example, many textbooks claim that ESs should be interpreted as a simple measure of the practical real-world importance of a result despite the fact that ESs are profoundly influenced by features of design and analysis strategy. We seek to highlight areas of misunderstanding about ESs found in the pedagogical literature in the light of the more specialist literature and make recommendations to researchers for the appropriate use and interpretation of ESs. This is critical as statistics textbooks have a crucial role in the education of researchers.     

Evidence for altered configural body processing in women at risk of disorders characterized by body image disturbance

Two studies were conducted to assess appearance-related visual processing mechanisms in populations at risk of disorders characterized by body image disturbance. Using inverted stimuli, Experiment 1 assessed visual processing mechanisms associated with body, face, and house viewing in adolescents. Experiment 2 applied the same protocol to assess appearance-related configural processing in high- and low-risk adolescent women, and women recovering from disorders characterized by body image disturbance. Experiment 1 found evidence for typical configural face and body processing, although adolescent women reported higher levels of body image concern (BIC) and self-objectified to a greater extent than adolescent men. In Experiment 2, typical body inversion effects were seen in the low-risk group, whilst there was some evidence to suggest a disruption to the configural processing of body stimuli in high-risk adolescents and in women recovering from body image disorders. Women in recovery were also quicker to respond to all stimuli, whilst high-risk adolescents took longer to respond to bodies than to other stimuli. Configural face processing was intact in all groups, and effects did not directly relate to BIC or self-objectification. These findings have implications for future research looking to inform early interventions and treatment, suggesting that there could be a tendency to visually process individual body parts at the expense of the whole-body form in women at risk of developing body image disorders, as well as those in recovery.     

The Orthodox Understanding of Marriage in the Ecumenical Context

This article deals with interchurch and interreligious marriage as a challenge to Orthodox theology and its self-conscience. The canons of the church came into being at a time when the church identified itself with history, and the Empire with the kingdom of God. Their purpose was to strengthen the historical construction of the church and the Empire. In such a context, the “other” was a threat to the historical existence of the church. Eschatology offers a different perspective, seeing the whole world as a church “in becoming.” Mixed marriages pose the following questions: How do we understand ourselves? How do we understand others? Our tradition has been challenged with new events and new realities, demanding bravery to solve them.     

Perceived Collective Efficacy and Parenting Competence: The Roles of Quality of Life and Hope

Parents' perceptions of their parenting competence predict successful implementation of parenting tasks and contribute to their interest and involvement in parenting and to their children's development. Thus, identifying factors that contribute to parents' perceptions of parenting competence can help inform efforts to promote children's safety and well-being. The present study employs social disorganization theory to examine the relationship between collective efficacy and parents' sense of competence, measured along two dimensions: parental efficacy and parental satisfaction. It examines the direct association between the two constructs and whether the association is mediated by parent perceptions of their quality of life (QOL) and sense of hope. Data were collected from 198 parents residing in a neighborhood in southern Tel Aviv, Israel. The analyses indicated that high collective efficacy was directly associated with high parental efficacy, but not with high parental satisfaction. Using structural equation modeling, a mediation model was found whereby higher collective efficacy was associated with (a) higher QOL, which in turn was related to a greater sense of hope, which was linked with higher parental efficacy; and (b) higher QOL, which was directly associated with higher parental satisfaction. The findings provide further support to the idea that neighborhood characteristics play an important role in parents' ability to care for their children.     

The World Council of Churches and the Theology of Christian-Jewish Relations

This essay explores the approach of the World Council of Churches (WCC) to the theological questions involved in Jewish-Christian relations, while also noting connections between these questions and political factors. The first part focuses on WCC assemblies. At Amsterdam in 1948, a brief document emphasized four key issues: the relationship of the Jewish people to God and to the Church; antisemitism; mission; and the State of Israel. At subsequent assemblies, especially after 1967, with attention focusing on the Israel-Palestine conflict and the plight of the Palestinians, theological discussion of these questions was avoided. The second part of the essay turns to the discussion of these four questions at other levels of the WCC, also considering the wider context of this discussion in the varied approaches developed among WCC member churches. A major theme throughout the essay is that because of the spectrum of ecclesiastical and regional affiliations across member churches, theological discussion of these questions has been controversial within the WCC. If its output in this field of theological work has therefore understandably been limited in comparison with that of some member churches and ecumenical partners, the WCC does nevertheless have a unique capacity to play a convening role for discussion of these difficult questions between Christians of different traditions and from very different political contexts.     

Discerning the Ministries of Women

In 1988, the historic Rhodes Inter-Orthodox Symposium on the Place of Women in the Orthodox Church encouraged, among other things, fuller participation of women in the life of the church. This article reports on the results of a study that solicited the views of Orthodox Christians regarding the participation of women in the life of the church. Nearly three-quarters of respondents clearly stated or intimated that they would like to see more opportunities for women to serve in the church. One-third of the respondents identified the issue of deaconesses in their essays. Responses here revealed a great diversity of experience, education, and opinion. Nevertheless, more than half of the respondents commenting on deaconesses showed an openness to this ministry. This may be a powerful measurement indicating that exploring the pastoral need for this and other ministries may well be long overdue.