Online epistemic communities: theoretical and methodological directions for understanding knowledge co-elaboration in new digital spaces

This paper presents, illustrates and discusses a generic framework for studying knowledge co-elaboration in online epistemic communities ("OECs"). Our approach is characterised by: considering knowledge co-elaboration as a design activity; distinguishing discussion and production spaces in OECs; characterising participation via the notion of role; fine-grained analyses of meaning, content and communicative functions in interactions. On this basis, three key issues for ergonomics research on OECs are discussed and illustrated by results from our previous studies on OSS and Wikipedia. One issue concerns the interrelation between design (task) and regulation. Whereas design task-oriented activity is distributed among participants, we illustrate that OCEs function with specialised emerging roles of group regulation. However, the task-oriented activity also functions at an interpersonal level, as an interplay of knowledge-based discussion with negotiation of competencies. Another issue concerns the foci of activity on the (designed) knowledge object. Based on a generic task model, we illustrate asymmetry and distinctiveness in tasks' foci of participants. The last issue concerns how design-use mediation is ensured by specific forms of mediation roles in OECs. Finally we discuss the degree of generality of our framework and draw some perspectives for extending our framework to other OECs.     

Ties in one block comparison experiments: a generalization of the Mallows–Bradley–Terry ranking model

This study is concerned with the extension of the Mallows–Bradley–Terry ranking model for one block comparison consisting of all the items of interest to situations which allow an expression of no preference. We consider a modification of the Mallows–Bradley–Terry ranking model by introducing an additional parameter, called an index of discrimination, in the model. This permits ties in the model. The maximum likelihood estimates of the parameters are found using a Maximization–Minimization algorithm: the evaluation of the mathematical expectations involved in the log-likelihood equation is obtained by generating samples of Monte Carlo Markov chain from the stationary distribution. In addition, a simulation study for asymptotic properties assessment has been made. The proposed method is applied to analyze data election.     

Leadership and followership identity processes: A multilevel review

A growing body of leadership literature focuses on leader and follower identity dynamics, levels, processes of development and outcomes. Despite the importance of the phenomena, there has been surprisingly little effort to systematically review the widely dispersed literature on leader and follower identity. In this review we map existing studies on a multilevel framework that integrates levels-of-the self (individual, relational and collective) with the levels-of-analysis (intrapersonal, interpersonal and group) on which leader or follower identity work takes place. We also synthesize work from multiple research paradigms, such as social psychology experimental studies, narrative accounts of leaders' identity work and field studies on antecedents, outcomes, mediating mechanisms and boundary conditions. Finally, we outline implications for leadership development and call attention to key themes we see ripe for future research.     

On Ehrhart polynomials and probability calculations in voting theory

In voting theory, analyzing the frequency of an event (e.g. a voting paradox), under some specific but widely used assumptions, is equivalent to computing the exact number of integer solutions in a system of linear constraints. Recently, some algorithms for computing this number have been proposed in social choice literature by Huang and Chua (Soc Choice Welfare 17:143–155 2000) and by Gehrlein (Soc Choice Welfare 19:503–512 2002; Rev Econ Des 9:317–336 2006). The purpose of this paper is threefold. Firstly, we want to do justice to Eugène Ehrhart, who, more than forty years ago, discovered the theoretical foundations of the above mentioned algorithms. Secondly, we present some efficient algorithms that have been recently developed by computer scientists, independently from voting theorists. Thirdly, we illustrate the use of these algorithms by providing some original results in voting theory. Helpful comments by Philippe Clauss and his team are gratefully acknowledged.     

Distributional effects of international commodity price stabilization: Do the aggregate gains apply to individual producing countries?

This paper demonstrates the different producer gains and losses that can occur from a price stabilization scheme in a same market. An international buffer stock model integrated in a trade flow model of commodity exports of the Latin American economies is used to simulate two representative products: coffee, where instability in the world market has originated mainly from changes in supply, and copper, where the major source of world market disturbances have been demand shifts. The results show that global generalizations as to the net benefits or costs of price stabilization are erroneous at the producer country level in supply or supply/demand dominated instability, a condition that typifies many primary commodity markets.     

The implementation of workplace violence policy in state government

Workplace violence has received an increasing amount of attention in the last five years. While it is difficult to conclude that it is actually escalating, the numerous studies do provide numbers that lead one to believe that it is a serious problem. Although agencies and corporations are beginning to develop workplace violence policies, there is no published research that documents the results of the implementation of such policies. The current research examines North Carolina state employees' familiarity with their new workplace violence policy and reporting procedures, how uniformally the policy is being utilized, victims' perceptions of their agencies' responses to their own violent incidents, and their generalized perceptions of the agencies' intent to keep the workplace safe.     

The Effect of Imputation Procedures on First Birth Intervals: Evidence from Five African Fertility Surveys

In most African societies there is little motivation to remember dates of demographic events with the level of precision required in demographic surveys. Consequently it is common that the large majority of survey respondents can provide only the calendar year of occurrence or their age at the time of the event. The World Fertility Survey Group decided to handle the problem of poor date reporting by using a computer program to impute the missing information. This article illustrates the effect of these imputation procedures on cross-national differentials in the proportion of premarital first births in Benin, Cameroon, Cote d’Ivoire, Ghana, and Nigeria. The analysis demonstrates that the exceptionally low proportion of premarital first births in Ghana is an artifact of the imputation procedures.     

Preparing adolescents for adulthood

Pregnancy-related school dropouts have become a matter of public concern throughout sub-Saharan Africa. In most cases, schoolgirls who become pregnant either have to resort to unsafe illegal abortions, or they face official school expulsion. Because girls who drop out of school due to pregnancy usually do not return to school to complete their education after the birth of their child, their opportunities for socioeconomic advancement are limited. Many African governments have included family life education programs in the school curriculum in an attempt to educate adolescents about the consequences and responsibilities associated with sexual activity. The high rates of schoolgirl pregnancies suggest that these programs have their shortcomings, and indicate that educational policies should attempt not only to reduce the incidence of schoolgirl pregnancies, but also to assist pregnant schoolgirls to complete their education. In this paper, we use data from a sample of 154 Kenyan primary and secondary schools to study differentials in the extent to which various types of schools are affected by pregnancy-related school dropouts, and to examine the opinions of the head teachers regarding teaching about contraceptive methods and readmittance of pregnancy-related dropouts.