ROBUST ANALYSIS OF THE BIFURCATING AUTOREGRESSIVE MODEL IN CELL LINEAGE STUDIES

A robust estimation procedure for the bifurcating autoregressive model in cell lineage studies is proposed. The method is illustrated by application to a real data set and is compared with least squares estimates in a small simulation study.     

The relationships between work characteristics and mental health: examining normal, reversed and reciprocal relationships in a 4-wave study

This longitudinal study examined the causal relationships between job demands, job control and supervisor support on the one hand and mental health on the other. Whereas we assumed that work characteristics affect mental health, we also examined reversed causal relationships (mental health influences work characteristics). Further, the topic of the appropriate time lag for testing causal relationships was addressed. Our hypotheses were tested in a 4-wave study among a heterogeneous sample of 668 Dutch employees using structural equation modelling. The results provide evidence for reciprocal causal relationships between the work characteristics and mental health, although the effects of work characteristics on well-being were causally predominant. The best model fit was found for a 1-year time lag. Compared to earlier—predominantly cross-sectional—results, the present study presents a stronger case for the effects of work characteristics on the development of strain. The results also emphasize the need for a dynamic view of the relationship between work and health; the one-directional viewpoint in many work stress models does not seem to fully capture the relations between work characteristics and well-being.     

Personal and Organizational Determinants of Perceived Absence Norms

A two-phase study employed a combination ofqualitative and quantitative methodology to studyabsenteeism in a complex, hospital setting. The primaryfocus was to identify the bases of employees' beliefs about what is acceptable and expected in termsof absence behavior. Through a series of employeeinterviews, two different absence cultures wereidentified. We found evidence that employees' normativeperceptions were influenced by their prior personalabsence, and by the average level of absence within boththeir immediate work group and the absence culture towhich they belonged. Perceived norms were also shown to predict future individual absence (totaldays absent) 1 year later. Theoretical and practicalimplications of this research were discussed.     

Europe,social exclusion and the identity of social work

This paper argues that the identity of social work as a form of professional practice within Europe is a timely matter for contemporary debate. Economic and political moves in Europe towards integration have created the possibility of establishing an identity which could both incorporate a range of diverse activities and also create a form of practice that is distinct. This article will address the emerging concept of social exclusion as a potential focus for social work professional practice in a changing global setting. It will be argued that the concept is one that can incorporate the broad range of practice in social work in a manner that could have similar meaning for all the different practitioners involved.     

Documenting community-level outcomes. Lessons from drinking and driving

Alcohol-related crashes cluster on Friday and Saturday evenings. One objective of this study was to contrast the demographic characteristics of operators who drive at these times with those who do not, through the comparison of data from two of the most widely used methods for gathering information on drinking and driving: Random Digit Dialing Telephone Surveys and Roadside Voluntary Breath Test Surveys. Roadside surveys set up at locations where alcohol-related crashes occur provide a better sample of those drivers most at risk of crash involvement. Telephone surveys, because they do not generally measure the exposure of drivers both in the location of driving and the number of miles driven, are less suited to identifying the drivers at risk. However, they highlight the large number of individuals who drive during high-risk times but avoid high-risk locations.     

Farmer Knowledge and Risk Analysis: Postrelease Evaluation of Herbicide-Tolerant Canola in Western Canada

The global controversy regarding the use of genetically modified (GM) crops has proved to be a challenge for "science-based" risk assessments. Although risk analysis incorporates societal perspectives in decision making over these crops, it is largely predicated on contrasts between "expert" and "lay" perspectives. The overall objective of this study is to explore the role for farmers' knowledge, and their decade-long experience with herbicide-tolerant (HT) canola, in the risk analysis of GM crops. From 2002 to 2003, data were collected using interviews ( n = 15) and mail surveys ( n = 370) with farmers from Manitoba and across Canada. The main benefits associated with HT canola were management oriented and included easier weed control, herbicide rotation, and better weed control, whereas the main risks were more diverse and included market harm, technology use agreements (TUAs), and increased seed costs. Benefits and risks were inversely related, and the salient factor influencing risk was farmer experiences with HT canola volunteers, followed by small farm size and duration using HT canola. These HT volunteers were reported by 38% of farmers, from both internal (e.g., seedbank, farm machinery, etc.) and external (e.g., wind, seed contamination, etc.) sources, and were found to persist over time. Farmer knowledge is a reliable and rich source of information regarding the efficacy of HT crops, demonstrating that individual experiences are important to risk perception. The socioeconomic nature of most risks combined with the continuing "farm income crisis" in North America demonstrates the need for a more holistic and inclusive approach to risk assessment associated with HT crops and, indeed, with all new agricultural technology.     

Who Uses Services for School Age Children: Evidence from the National Evaluation of the Children's Fund

The UK government has made integration of services for children a priority with the target being a better and more integrated provision of preventative services under the various schemes such as the Children's Fund and Sure Start. This article gathers evidence from the National Evaluation of the Children Fund with the aim of analysing the characteristics of users and non‐users of services in order to see whether the target groups have been reached. The article provides evidence that the services have reached their target groups, although different services are used by different kinds of families, and is set within a wider context of the analysis of service provision and use.     

Less than Human? Diaspora,Disease and the Question of Citizenship

The aim of this special edition of International Migration is to bring about discussion between those conducting research in Diaspora Studies and the Anthropology of Public Health and Medicine. Historically, international migration has been associated with the transport of disease. Regardless of the evidence, metaphors of plague, and infection have circulated and been used to marginalise and keep out diaspora communities in host countries in an effort to ‘exclude filth’. Migrants have been referred to in terms such as the ‘Asiatic menace’ indicating a virus‐like threat to local populations. We look at the impact the traces of these images have on current host nations’ perceptions of diaspora communities and also ask what impact does this have on the diasporic communities’ self‐perceptions, if any? Does this affect conceptions of belonging, or feed into continuing dialogues of displacement? The movement of people has long been associated with the spread of disease and infections. In light of this, we are concerned with the role of medical knowledge and practices in relation to diaspora communities, and how these discourses have contributed to the perception of diaspora populations by host societies, and helped shape wider questions of belonging and citizenship. We aim to look at these questions in their historical context, both in their continuities and discontinuities, emphasising the importance of this to an understanding of current practices. Circuits of migration, and connected medical practices are taking new forms, where, on the one hand migrants are still associated with disease and pollution, but on the other migrants are also increasingly staffing the infrastructure of western public health services. At the same time, the west can no longer lay claim to ‘superior’ biomedical provision. These shifts signal new directions in the relationship between medical discourse and diasporic ‘others’, giving rise to a contradictory language of migrants being seen as both a threat, and a solution to the ‘health of the nation’.     

Managing Capital Market Reactions to Corporate Social Resposibility

Although overlooked to some degree by non-marketing disciplines, the discipline of marketing has contributed significantly to the body of knowledge on business strategy over the last two decades. This paper evaluates these contributions, examines how they complement dominant non-marketing theories of business strategy, and shows how marketing offers a generalized theory of competition that integrates the concepts of both marketing and non-marketing theories of business strategy.