Estimating individual and group preference functionals using experimental data

In this paper, the empirical performance of several preference functionals is assessed using individual and group experimental data. We investigate if there is a risky choice theory that fits group decisions better than alternative theories, and if there are significant differences between individual and group choices. Experimental findings reported in this paper provide answers to both of those questions showing that expected utility gains a “winning” position over higher-level functionals (we considered disappoint aversion and two variants of rank-dependent utility) when risky choices are undertaken by individuals as well as by small groups. However, in the group experiment, alternatives (and, most notably, disappoint aversion) improve their relative performance, a fact that hints at the existence of differences between individual and group choices. We interpreted this result as evidence that feelings-like disappointment aversion become stronger in group decision.     

For whom does social comparison induce risk-taking?

A ‘bonus culture’ among financial traders has been blamed for the excessive risk-taking in the run-up to the latest financial crisis. I show that when individuals are more social gain seeking than social loss averse (i.e. gloating is stronger than envy), social comparison predicts more risk-taking as well as a preference for negatively correlated gambles. Testing these two joint propositions in a laboratory experiment, I find that preference for positively or negatively correlated outcomes is highly correlated with risk-taking in a social risky investment task. While only a third of subjects prefer negatively correlated outcomes in a peer comparison setting, in line with relatively stronger social gain seeking, those subjects invest on average 50 % more in a risky gamble in their peer comparison setting than a reference group that made the same decision in an isolated individual setting. Subjects with a preference for positively correlated outcomes, in line with relatively stronger social loss aversion, do not show a higher propensity to invest in a risky gamble compared to the individual reference group.     

Preference aggregation and statistical estimation

This paper deals with various connections that are found to exist between statistical estimation methods for decision-making and rules of group choice in the social choice area. Initially the aggregation of individual opinions is formulated as a pattern recognition problem; firstly it is shown that individual preferences lead to a natural representation in terms of binary patterns. Then we proceed to show how the search for a group preference pattern can be conducted by classifying the input preference patterns into various pattern classes and using the resulting classification boundaries to define the area of mutual agreement over some of the available alternatives. This leads to a decision-theoretic problem which consists in defining a decision rule (for classification) that is least likely to lead to misrecognition of arbitrary preference patterns. A maximum likelihood solution is obtained and compared with some well-known rules of group decision-making. Other solutions are also possible, on the basis of different optimality criteria, and their social choice interpretation is suggested. Finally, a method using Coleman's linear model for attributes is applied to yield group decision rules by feature weighting of election issues.     

Group Influences on Individual Aggression and Prosociality: Early Adolescents Who Change Peer Affiliations

The present study addresses the influence that group norms exert on individual aggressive and prosocial behavior. The study hypothesis is that for early adolescents who change their peer group affiliations, the characteristics of the group they are leaving (departing‐group influence) are not as influential as those of the group that they are joining (attracting‐group influence). From a larger sample of fifth and sixth graders who were followed over a one‐year period, 198 early adolescents were identified as those who changed peer group affiliations. Peer nominations on aggression, prosociality, social preference and popularity, and social network information were collected. Results confirmed that there were significant attracting‐ but not departing‐group influences on aggression and prosociality. Expected associations between aggression, prosocial behavior, and social status were confirmed. The discussion is framed around a social‐ecological perspective that emphasizes the short‐term adaptive nature of aggressive behavior in some peer groups and the need for considering social mobility when assessing group influence on individual behavior.     

Partial information on decisional competences and the desirability of the expert rule in uncertain dichotomous choice situations

The paper analyzes the expert resolution problem by employing extended versions of the uncertain dichotomous choice model. The main purpose of this study is to illustrate how the analysis of optimal decision rules can be carried out while dispensing with the common restrictive assumption of full information regarding individual decisional competences. In contrast to most previous studies in this field we here evaluate the expert rule under alternative assumptions regarding the available partial information on judgmental competences rather than compare it in an ad hoc manner to some common alternative rules, such as simple majority rule. A fuller optimality analysis allowing the evaluation of all relevant decision rules, and not merely the expert rule, is attempted for a five-member panel of experts assuming a uniform distribution of individual competences. For three-member groups the optimality issue is resolved by assuming no information on individual competences and interpreting the expert rule as an even-chance lottery on skills.     

Choosers as extension axioms

We consider the extension of a (strict) preference over a set to its power set. Elements of the power set are non-resolute outcomes. The final outcome is determined by an “(external) chooser” which is a resolute choice function. The individual whose preference is under consideration confronts a set of resolute choice functions which reflects the possible behaviors of the chooser. Every such set naturally induces an extension axiom (i.e., a rule that determines how an individual with a given preference over alternatives is required to rank certain sets). Our model allows to revisit various extension axioms of the literature. Interestingly, the Gärdenfors (1976) and Kelly (1977) principles are singled-out as the only two extension axioms compatible with the non-resolute outcome interpretation.     

A note on the relationship of interdependent action to the optimality of certain voting decisions

While the theory of public goods points to socially suboptimal contributions by agents acting under Cournot assumptions, this externality can be rectified by the introduction of positive interdependence of actions to the individual's choice calculus. This paper draws attention to the fact that the institution of democratic voting is itself a means of transforming the individual calculus in such a way that parameter changes are evaluated as simultaneous adjustments by the group, on the side of benefits, but by the individual only, on the side of costs, thus generating optimal parameter preference in the case of identical agents.     

Group leaders’ experiences in heterogenous grief support groups

Group processes in social work are complex. In this article, the authors examine how Norwegian leaders experience these processes during their grief support group work. The authors take a qualitative approach, specifically semistructured interviews. Seven group leaders participated. Using qualitative content analysis, the authors found new and supporting information as presented in two inter-related themes: (1) Achieving cohesion is a challenging balance and (2) Facilitating the group activity is linked to group leaders’ engagement and competence. The authors suggest that group work is enhanced by well-qualified leaders paying attention and understanding toward the ongoing group processes, homogenous groups, prescreening, individual timing, and group cohesion.     

Transforming Social Group Work Learning into Competencies for Interprofessional Teams

This article describes how social work and social group work strategies are used to enhance social work student participation in an interprofessional education program (IPE) that includes social work and five health care disciplines. Concurrently, social work students take part in a small group to assist them in the application of their social group knowledge to their IPE experience. Interprofessional collaborations between social work and health care can work toward alleviating health inequalities and poor access to health services. Social work has a crucial and significant role within these teams because of the profession’s focus on individual well-being, within the context of their social environment and support systems.     

GEC大学生小组工作模式探索与实践

小组工作（Social Group Work）,是社会工作专业三大基本工作方法之一,旨在通过有目的小组活动,协助个人开发潜能、实现成长。大学生小组工作,是以大学生为服务对象开展的小组工作领域。笔者运用行动研究方法,在近三年的实践基础上,提出＂GEC大学生小组工作模式＂（以下简称GEC模式）,即针对不同年级大学生所面临的实际问题,分别开展成长小组（Growth Group）、增能小组（Empowerment Group）、职业生涯规划小组（Ca-reer Planning Group）,真正实现＂小组伴我成长＂的理念。本文将阐述GEC模式的提出背景、运行机制、实践情况及评估结果。     

Economic openness and welfare state attitudes: A multilevel study across 67 countries

This article extends previous studies investigating economic globalisation and the welfare state by examining individual attitudes, ranging from a preference for individual responsibility (economic individualism) to public demand for government intervention (social equality), across a large number of countries. It formulates different hypotheses about the direct and moderating effects of economic openness on these attitudes. The multilevel analysis, investigating data from 99,663 citizens of 67 countries, leads to the following two conclusions. First, economic openness is associated with a stronger preference for economic individualism and less demand for government intervention. Second, groups benefiting from globalisation and right‐wing voters have a stronger preference for economic individualism if the economic openness of their country is higher. Key Practitioner Message: ● The results show that some vulnerable groups demand more social protection in economically more open countries.     

Eliciting risk preferences: When is simple better?

We study the estimation of risk preferences with experimental data and focus on the trade-offs when choosing between two different elicitation methods that have different degrees of difficulty for subjects. We analyze how and when a simpler, but coarser, elicitation method may be preferred to the more complex, but finer, one. Results indicate that the more complex measure has overall superior predictive accuracy, but its downside is that subjects exhibit noisier behavior. Our main result is that subjects’ numerical skills can help better assess this tradeoff: the simpler task may be preferred for subjects who exhibit low numeracy, as it generates less noisy behavior but similar predictive accuracy. For subjects with higher numerical skills, the greater predictive accuracy of the more complex task more than outweighs the larger noise. We also explore preference heterogeneity and provide methodological suggestions for future work.     

Raising awareness of transformative ecosocial work: Participatory action research with Australian practitioners

This article reports on Participatory Action Research with social work practitioners who collaboratively explored the effects on professional practice when practitioners raise their awareness of an ecosocial work approach. Although contemporary research in the profession has contributed to the ongoing development of ecosocial work, there is a notable lack of collaboration with social work practitioners. Using a transformative ecosocial work model of practice, researchers together with social workers from a range of practice contexts met as co‐inquirers to plan, implement and evaluate ecosocial work interventions. As part of a larger international study, this article reports on research outcomes within the Australian context. Overall, results indicate that practitioners incorporated interventions across personal, individual, group and organisational levels of practice, but were constrained by structural elements at broader levels. Continuing the development of ecosocial work requires further collaborative exploration with practitioners, which takes into consideration communities and broader social and political systems. Key Practitioner Messages: ? This research endeavours to contribute to the evidence‐base for progressing transformative ecosocial work in professional practice; ? Using Participatory Action Research (PAR), this research was done in collaboration with social work practitioners as co‐inquirers to develop ecosocial work interventions; ? A range of ecosocial work interventions were implemented at the personal, individual, group and organisational levels.     

Group Work with Natural Parents in Permanency Planning

Group work with parents of children in foster care has good potential as a complement to casework services in permanency planning. An underused social work service in child welfare, group work has rarely been provided to natural parents. It can be utilized differentially along the foster care continuum from needs identification through aftercare to provide parents information, support and training specific to foster care. Reports of group work services for abusing parents, parents of children in residential treatment and special programs for natural parents provide relevant information for design of group work with natural parents. An example of a group of parents whose children are in foster home placement is presented. Special considerations for providing group services to natural parents are highlighted. Group work appears to have positive effects on the providing agency as well as on parent group participants. Issues regarding group work in permanency planning include the risk of its misuse through agency-imposed agendas and/or agency determined timetables for individual and group development. It will be helpful to study what group services with which parents at which points in the foster care continuum assist permanency planning efforts.     

Beyond Condorcet: optimal aggregation rules using voting records

In certain judgmental situations where a “correct” decision is presumed to exist, optimal decision making requires evaluation of the decision-makers’ capabilities and the selection of the appropriate aggregation rule. The major and so far unresolved difficulty is the former necessity. This article presents the optimal aggregation rule that simultaneously satisfies these two interdependent necessary requirements. In our setting, some record of the voters’ past decisions is available, but the correct decisions are not known. We observe that any arbitrary evaluation of the decision-makers’ capabilities as probabilities yields some optimal aggregation rule that, in turn, yields a maximum-likelihood estimation of decisional skills. Thus, a skill-evaluation equilibrium can be defined as an evaluation of decisional skills that yields itself as a maximum-likelihood estimation of decisional skills. We show that such equilibrium exists and offer a procedure for finding one. The obtained equilibrium is locally optimal and is shown empirically to generally be globally optimal in terms of the correctness of the resulting collective decisions. Interestingly, under minimally competent (almost symmetric) skill distributions that allow unskilled decision makers, the optimal rule considerably outperforms the common simple majority rule (SMR). Furthermore, a sufficient record of past decisions ensures that the collective probability of making a correct decision converges to 1, as opposed to accuracy of about 0.7 under SMR. Our proposed optimal voting procedure relaxes the fundamental (and sometimes unrealistic) assumptions in Condorcet’s celebrated theorem and its extensions, such as sufficiently high decision-making quality, skill homogeneity or existence of a sufficiently large group of decision makers.     

A graph-theoretical approach to the aggregation of individual preference orderings

A graph-theoretical approach as first outlined by Harary et al. is developed for solving the problem of aggregating a given set of individual preference orderings provided that no individual preferential judgment is inconsistent with the collective preference ordering obtained by aggregation.

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Popularity Contagion Among Adolescents

This study aimed to support the theory of popularity contagion, which posits that popularity spreads among friends spontaneously and regardless of behavioral changes. Peer nominations of status and behavior were collected annually between 6th and 12th grades from a total of 1062 adolescents. Longitudinal hypotheses were mostly supported using path analyses, showing (1) that individual popularity could be predicted by friends’ popularity levels over time, even when controlling for stability of individual popularity; (2) that this prediction was not accounted for by behavioral contagion of aggressive or prosocial behaviors; and (3) that individual social preference generally could not be predicted by friends’ preference levels over time. Implications, limitations, and directions for future research are discussed.     

The Group versus the Individual as the Unit of Analysis in Small Group Research

It is common for social work researchers to use the individual as the unit of analysis in small group research. This paper examines the discrepancies that may exist between analyses that incorporate the individual and those that incorpo- rate the group as the unit of analysis. An example is presented with data collected from 331 members of 53 workgroups in 22 different human service organizations. Researchers are cau- tioned against drawing conclusions about groups from data based on the individual as the unit of analysis.