Frame-changing in the media coverage of a school shooting: The rise of Columbine as a national concern

This essay explores the media frame-changing process in the news coverage of the 1999 Columbine shootings, clarifying the news discourse focus on Columbine's national importance. The study applies the van Dijk/Bell scheme of media analysis to 683 news articles from print and broadcast media published within 30 days following the incident. Insight is offered into the thematic content of the Columbine coverage, including the school shooting event itself, reactions, and commentaries. Analysis indicates that the initial focus of the coverage was what happened at Columbine, but over time the news increasingly highlighted Columbine's national salience.     

Integrated Approaches for the Public Health Prioritization of Foodborne and Zoonotic Pathogens

To address the persistent problems of foodborne and zoonotic disease, public health officials worldwide face difficult choices about how to best allocate limited resources and target interventions to reduce morbidity and mortality. Data‐driven approaches to informing these decisions have been developed in a number of countries. Integrated comparative frameworks generally share three methodological components: estimating incidence of acute illnesses, chronic sequelae, and mortality; attributing pathogen‐specific illnesses to foods; and calculating integrated measures of disease burden such as cost of illness, willingness to pay, and health‐adjusted life years (HALYs). To discuss the similarities and differences in these approaches, to seek consensus on principles, and to improve international collaboration, the E.U. MED‐VET‐NET and the U.S.‐based Food Safety Research Consortium organized an international conference convened in Berlin, Germany, on July 19–21, 2006. This article draws in part on the deliberations of the conference and discusses general principles, data needs, methodological issues and challenges, and future research needs pertinent to objective data‐driven analyses and their potential use for priority setting of foodborne and zoonotic pathogens in public health policy.     

Managing Invasive Species in the Presence of Endogenous Technological Change with Uncertainty

This research incorporates the development and adoption of an induced technology under uncertainty into a conceptual dynamic model to more broadly examine efficient policies for mitigating invasive species infestations. We find that under optimal policy, marginal costs of adopting conventional control measures are equal to the sum of the marginal benefits from development and adoption of new technology, as well as the use of conventional control measures. This result implies that a resource allocation designed for controlling invasive species is not adequate when an induced technology is not considered. Our results also reveal that the shadow values associated with the probabilities of developing and then adopting an induced technology increase as the shadow values associated with the stock of an invasive species population increase.     

Impact of Social Changes and Birth Cohort on Subjective Well-Being in Chinese Older Adults: A Cross-Temporal Meta-analysis, 1990–2010

Over the past several decades, the proportion of older adults in the Chinese population has steadily increased during a period of substantial social change; the effect of these changes on older adults warrants examination. The present study explored changes in subjective well-being (SWB) in older adults by birth cohort and the social factors influential in these changes. We performed a cross-temporal meta-analysis using data from 20,713 adults over 60 years of age; data were obtained from 61 studies that used the Memorial University of Newfoundland Scale of Happiness. The dynamics of SWB in older adults were evaluated as a function of time. The mean SWB score decreased by 4.98 over the measured period, indicating a decrease of .52 standard deviations between 1990 and 2010. In addition, SWB in older adults was significantly correlated with high social connectedness and low overall threat. Specifically, urbanization level, Gini coefficient, personal medical expenditure, and birth rate were strong predictors of SWB. Our research demonstrates that social connectedness and overall threat contribute to SWB in Chinese older adults. As SWB is significantly related to the mental and physical health of older adults, the present study may serve as a useful reference for health care agencies and policy-makers.     

Reaching Beyond the Net: Political Circuits and Participation in Toronto's G20 Protests

Using a survey of 359 participants in the 2010 protests against the G20 in Toronto, this paper examines the effects and effectiveness of the different communication media in informing diverse participants about the protest. It finds that the communication networks that surrounded the G20 summit protest in Toronto in 2010 were dense and interconnected. Drawing on Tilly's ‘political circuits’, the survey shows that activists at the core of these networks used a combination of online and offline modes of communication, while those outside of that core were reliant on fewer channels of information about the protests. These included people of colour, people who are not part of student networks, less educated people and people less involved in existing social movements. Using logistic regression models, we demonstrate that the digital divide may be less important than the structure and means of communication that make up the political circuits of a movement. Based on these models, we argue that communication modes such as social networking sites and the mainstream media may be important tools for bridging the gap between core and peripheral participants.     

Inferring beliefs as subjectively imprecise probabilities

We propose a method for estimating subjective beliefs, viewed as a subjective probability distribution. The key insight is to characterize beliefs as a parameter to be estimated from observed choices in a well-defined experimental task and to estimate that parameter as a random coefficient. The experimental task consists of a series of standard lottery choices in which the subject is assumed to use conventional risk attitudes to select one lottery or the other and then a series of betting choices in which the subject is presented with a range of bookies offering odds on the outcome of some event that the subject has a belief over. Knowledge of the risk attitudes of subjects conditions the inferences about subjective beliefs. Maximum simulated likelihood methods are used to estimate a structural model in which subjects employ subjective beliefs to make bets. We present evidence that some subjective probabilities are indeed best characterized as probability distributions with non-zero variance.