Sensitivity of the portmanteau statistic in time series modeling

The portmanteau statistic is commonly used for testing goodness-of-fit of time series models. However, this lack of fit test may depend on one or several atypical observations in the series. We investigate the sensitivity of the portmanteau statistic in the presence of additive outliers. Diagnostics are developed to assess both local and global influence. Three practical examples demonstrate the usefulness of the proposed diagnostics.     

Media Studies 2.0? Binge Drinking and Why Audiences Still Matter

The idea of 'audience' no longer appears to suit media studies. Conceiving the public as sponges for information and entertainment may have worked in the television age. But not so the computer, mobile phone, iPod era. Increasingly, it appears that the public amuse and inform themselves, using media to create and circulate their own content. This presents media scholars with a considerable challenge, as outlined in David Gauntlett's announcement of 'Media Studies 2.0'. One goal of the new discipline is to dispense with 'audience' as a meaningful category. This essay will argue that this is a rhetorical shift only possible because of audience research. Additionally, in describing a study of young student drinkers, the essay will argue that traditional, 'receiver' definitions of audience offer an important means for the public to enter policy debates on binge culture. Abandoning audience thus also means ignoring media issues that the public feel are important.     

The development of the resource-based view of the firm: A critical appraisal

Over the last 20 years, the resource-based view (RBV) has reached a pre-eminent position among theories in the field of strategy, but debate continues as to its precise nature. This paper contributes to the debate by critically reviewing the development of the RBV to date. The critical appraisal examines the development of the RBV in terms of theory, method, empirical evidence and practical insights. It is contended that the permeable and eclectic nature of the RBV stems from its being a theory about what firms are and how they function, and that its popularity is due to an absence of limiting behavioural assumptions. Finally, the authors provide their own subjective views on where they think RBV scholars should focus their efforts in the future.     

Researching youth culture and popular music: a methodological critique

In this article I argue the need for critical evaluation of qualitative research methodology in sociological studies of the relationship between youth culture and popular music. As the article illustrates, there is currently an absence of critical debate concerning methodological issues in this field of sociological research. In the first part of the article I begin to account for this absence by illustrating how early research on youth and music rejected the need for empirical research, relying instead on theories and concepts drawn from cultural Marxism. The second part of the article illustrates how the legacy of this early body of work in youth and music research manifests itself in current research which, although empirically grounded, is characterized by an almost total lack of engagement with methodological issues such as negotiating access to the field, management of field relations and ethical codes. Similarly problematic is the uncritical acceptance on the part of some researchers of their insider knowledge of particular youth musics and scenes as a means of gathering empirical data. In the final part of the article I focus on the issue of insider knowledge and the need for critical evaluation of its use as a methodological tool in field-based youth and music research.     

A Terror Management Perspective on Ageism

In the present article, we present a theoretical perspective on ageism that is derived from terror management theory. According to the theory, human beings manage deeply-rooted fears about their vulnerability to death through symbolic constructions of meaning and corresponding standards of value. We extend this perspective to suggest that elderly individuals present an existential threat for the non-elderly because they remind us all that: (a) death is inescapable, (b) the body is fallible, and (c) the bases by which we may secure self-esteem (and manage death anxiety) are transitory. We review some recent empirical evidence in support of these ideas and then discuss possible avenues for combating ageism.     

The Environmental Geochemistry and Bioaccessibility of Mercury in Soils and Sediments: A Review

There have been many studies of mercury geochemistry in the environment and its bioconcentration/bioaccumulation through the aquatic food chain. However, there is a dearth of information regarding the bioaccessibility of mercury in human receptors exposed primarily by soil ingestion. This paper reviews the current state of knowledge of mercury bioaccessibility and speciation in soils, and the utility of speciation methods to estimate mercury bioaccessibility. We conclude that additional research is necessary to determine: (1) whether analytical measurements can adequately determine the bioaccessibility of mercury in sediments and soils; (2) the accuracy of in vitro analyses in assessing mercury bioaccessibility; (3) the ability of mercury to cross tissue membranes of the mouth, esophagus, stomach, and the small and large intestines; (4) the speciation and distribution of mercury in biological fluids; and (5) mercury bioavailability using an in vivo animal model relevant to human gastrointestinal tract conditions.     

Effect of Interviewer Experience on Interview Pace and Interviewer Attitudes

Traditional statistical analyses of interviewer effects on surveydata do not examine whether these effects change over a fieldperiod. However, the nature of the survey interview is dynamic.Interviewers’ behaviors and perceptions may evolve asthey gain experience, thus potentially affecting data quality.This paper looks at how interview length and interviewer evaluationsof respondents change over interviewers’ workloads. Multilevelmodels with random interviewer effects are used to account forthe clustering of cases within interviewers and individual interviewercharacteristics in the 1984, 1988, and 2000 National ElectionStudies. The 1984 and 1988 NES released sample in four replicates,minimizing the confound between order in an interviewers’workload and sample composition. We find that over the courseof the studies, both measures change significantly. Interviewerprior survey experience also was significantly negatively relatedto the length of the interview. These findings have implicationsfor interviewer training prior to and during studies, as wellas suggesting future research to reveal why these behaviorsand perceptions change.     

Reducing attrition in physical activity programs for older adults

This study investigated attrition in a 6-month physical activity intervention for older adults. The program was based on the social-cognitive theory incorporating self-efficacy factors. Two hundred forty-eight insufficiently active 65- to 74-year-olds were recruited from the Australian federal electoral roll. The intervention comprised walking and strength and flexibility exercises and was conducted in 30 local neighborhoods where the participants resided. Characteristics of individuals lost to attrition (n = 86, 35%) were compared with those of program completers (n = 162, 65%). Logistic-regression analysis showed that those lost to attrition came from areas of lower socioeconomic status, were overweight and less physically active, and had lower walking self-efficacy scores and higher loneliness scores. The results suggest that early assessment of these characteristics should be undertaken to identify individuals at risk of attrition, to improve retention, and to avoid potential bias.     

The Brazilianisation of Youth Transitions in Australia and the UK?

A central theme of Beck's argument in The Brave New World of Work (2000) is that labour markets in the developed world are taking on some of the core characteristics that have been associated with less developed labour markets such as employment insecurity, informality and precarity. A process he refers to as Brazilianisation. In this paper we consider whether Beck's thesis can help us understand changes in youth transitions in Australia and the UK by developing a comparative analysis of processes of casualisation in the youth labour markets of the two countries. We assess the extent to which precarious labour market biographies have become entrenched and represent modern forms of engagement with the labour market. While evidence is presented to suggest that young people's labour market experiences have been affected by a trend towards greater casualisation, we argue that the changes are having the greatest impact on those in the weakest positions: in both countries women are more likely to be affected than men and casualisation is most evident in the lowest skilled occupations.     

“a Difficult Life”: The Perceptions and Experience of Poverty in South Africa

The purpose of this article is to provide a fuller and more integrated understanding of poverty based on the results of a nation wide participatory study recently completed in South Africa. A surprisingly consistent view of poverty emerges from the study which includes social isolation, malnourished children, crowded homes, the use of basic energy sources, no employment, and fragmented households. A clear image of what results from extreme poverty also emerges comprising continuous ill health, arduous and often hazardous work for virtually no income, no power to influence change, and high levels of anxiety and stress. The article concludes that conventional definitions of poverty do not fully describe the experience of poverty as analysed by the poor themselves. Instead, the multidimensional nature of poverty suggests that three basic concepts would be useful in any analysis of extent, nature and persistence of poverty. These are sufficiency, access and vulnerability.