A comparison of various methods for estimating the parameters in mixtures of von mises distributions

In this paper we compare five methods for estimating the unknown parameters in a mixture of two von Mises distributions. We propose a new method based on the characteristic function and compare it with the classical methods based on maximum likelihood and moments. Thus far these methods have been successfully applied only to linear data. Here we show that the application to circular data is reasonably straightforward and that convergence to the final estimates is fairly rapid. For various simulated known mixtures the results obtained are satisfactory. Finally, we introduce a modification of the method of moments which is considerably faster in CPU time than any of the other methods used and gives good results.     

Global civil society or ‘networked globality’: beyond the territorialist and societalist paradigm

The concept of global civil society (GCS) is central to treatments of globalization and to depictions of a contested globality. This article offers a novel critique of the concept and its value for a critical social science of globalization. It argues that received notions of GCS are rooted in territorialist and societalist paradigms of the social and should not be used to subvent an account of globalization located in the dynamics of trans and even post-societal and post-national connections and the kind of world they intimate. GCS and variants such as cosmopolitanism are examined to evaluate whether they can provide a way of bridging the gap between territorialist and societalist assumptions about the organization of the social and the increasingly post-societal and post-territorial nature of the world. The aim is to avoid the inviting, but ultimately misleading sleight of hand through which GCS is revealed as the boundary-less equivalent of civil society, but with all the normative and aesthetic baggage of the latter still attached. The article ends with a critical discussion of the claim that globalization processes of connection are producing a networked globality in which reflexive agency is not lost. To recognize this requires a radical take on networks and their ontologies and being skeptical about much of the received sociology of globalization.     

Political Activist As Participant Observer: Conflicts Of Commitment In A Study Of The Draft Resistance Movement Of The 1960's*

In studying the draft resistance movement of the 1960's the author combined sociological observation with active and politically committed participation in the movement. The resulting conflicts of loyalty were rooted in basic characteristics of the movement, and of field research as a way of being in and experiencing the world. There were conflicts between political and research goals in daily decisions about how to allocate time and energy, and in larger choices about whether to take risks and to more fully join the community of fate of the movement. The role of researcher became a retreat, expressing limits to involvement and risk-taking, and providing a point of outside leverage which full participants lacked. The movement's ways of defining and interpreting experience ran counter to the more detached and routihizing perspectives of sociology. Conflicts between being a committed participant and an observing sociologist culminated in a sense of betraying the movement, and raised basic questions about uses, organization, and types of knowledge.     

Feeling at Home at Work: Life in Academic Departments

Qualitative Sociology -     

Why Competition from a Multi‐Channel E‐Tailer Does Not Always Benefit Consumers*

Empirical studies have delivered mixed conclusions on whether the widely acclaimed assertions of lower electronic retail (e‐tail) prices are true and to what extent these prices impact conventional retail prices, profits, and consumer welfare. For goods that require little in‐person pre‐ or postsales support such as CDs, DVDs, and books, we extend Balasubramanian's e‐tailer‐in‐the‐center, spatial, circular market model to examine the impact of a multichannel e‐tailer's presence on retailers' decisions to relocate, on retail prices and profits, and consumer welfare. We demonstrate several counter‐intuitive results. For example, when the disutility of buying online and shipping costs are relatively low, retailers are better off by not relocating in response to an e‐tailer's entry into the retail channel. In addition, such an entry—a multichannel strategy—may lead to increased retail prices and increased profits across the industry. Finally, consumers can be better off with less channel competition. The underlying message is that inferences regarding prices, profits, and consumer welfare critically depend on specifications of the good, disutility and shipping costs versus transportation costs (or more generally, positioning), and competition.     

Drinking and Driving: Alcohol Association with Traffic Accidents

An analysis of drink-driving research methods and findings with reference to traffic accidents is presented. This analysis is used to challenge some of the conclusions about drinking and driving that have gained wide currency in Australia and New Zealand. The growing acceptance of Scandinavian-type laws is critically evaluated. The demand to ‘criminalize’ drink-driving offences is rejected. The reduction of deat and damage from traffic accidents is presented as the real problem, not the drinking and driving of the population at large.