Internet use among community college students: implications in designing healthcare interventions

The Internet has become a commonly used venue for seeking healthcare information. Young adults search the Internet for health information more than any other group, yet little is known about use patterns among community college students. The authors surveyed a diverse community college to assess students' use of the Internet for health-related information. More than 80% had home Internet access, regardless of race or gender. Men and women searched for health information in almost equal numbers. Most students were interested in searching for diet/nutrition topics, and least interested in smoking information. Although the digital divide appears to be closing, varying levels of interest in a variety of important health topics remain. Understanding these differences could guide the design of more effective Web-based health interventions.     

Unconditional Quantile Regressions

We propose a new regression method to evaluate the impact of changes in the distribution of the explanatory variables on quantiles of the unconditional (marginal) distribution of an outcome variable. The proposed method consists of running a regression of the (recentered) influence function (RIF) of the unconditional quantile on the explanatory variables. The influence function, a widely used tool in robust estimation, is easily computed for quantiles, as well as for other distributional statistics. Our approach, thus, can be readily generalized to other distributional statistics.     

Intergenerational reliance on social assistance: Evidence from Canada

This paper provides the first analysis of the intergenerational transmission of participation in a Canadian social assistance program. Two sources of intergenerational transmission are taken into account: one that is due to a possible causal link between parents' and children's participation, and one that is due to a correlation between individual and environment specific characteristics across generations. The basic data come from the Québec government's administrative records and cover 17,203 young people who were 18 years old in 1990 and whose parents were recipients of social assistance during at least one month between 1979 and 1990. The results reveal that, on average, a one-percentage unit increase in parental participation during the youth's pre-adult years (age 7–17) raises the youth's participation rate by 0.29 percentage unit during early adulthood (age 18–21). This impact is stronger during the early stages of childhood (age 7–9) and during late adolescence (age 16–17).     

Children's appraisals as mediators of the relationship between domestic violence and child adjustment

This study examines the relationships among variables that were likely to mediate the effects of exposure to domestic violence on children's internalizing problems (i.e., children's appraisals of domestic violence and their perceptions of family relationships). The study was conducted with 79 children exposed to domestic violence, including 41 boys and 38 girls, aged between 9 and 12 years old. Indicators used for children's appraisals of violence were attribution of blame and perceived threat. Children's perceptions of family relationships were based on their levels of parentification and the degree of their loyalty conflicts. A path analysis was used to verify the predictive model's pathways and to test the multiple mediator effects. Findings confirm the contribution of mediating variables and also reflect the association between self-blame and children's parentification. The results stress the relevance of evaluating the combined role of different potential mediators to provide a better understanding of the impact of domestic violence on children.     

Educational interventions for people with social and health difficulties in Italy: the case of a ‘welcoming community’ for young and adults

This article presents a case study that we consider significant for the social work of ‘welcoming communities’ in Italy. In the first part, we describe the history, methodologies and educational instruments aimed at young adults with social and work integration difficulties. In the second part, we present research questions, methods and results of a field research study carried out over 8 years, during which researchers were continuously present. All the 375 persons living in the welcoming community Villa S. Ignazio, in Northern Italy, have been observed. In the conclusions, we point out the main elements for a critical reflection that may lead to a methodological enhancement of the activities, also considering the global economic and political crisis, which is particularly dangerous for the rights of the vulnerable people.     

Perspectives on organizational justice: Concept clarification,social context integration,time and links with morality

Organizational justice is concerned with people's fairness perceptions in organizations and has been a popular field of study in the social sciences for at least 25 years. This paper reviews the core concepts, models and questions of organizational justice research. Four research areas that are particularly critical for the future of the field will be highlighted: concept clarification, social context integration, time and links with morality. These areas have received increased attention lately, but there are still relatively few empirical studies and theoretical frameworks that grapple with these issues. Concept clarification is vital for improved consistency of the field and for internal validity of studies. Situating organizational justice in social contexts and in time will be crucial to improve external validity and the usability of organizational justice findings in organizations. Understanding the links between morality and justice at an individual level, and at the organizational and societal levels is necessary if justice researchers want to live up to the promise of their field for society. For each of these four areas, recent developments will be reviewed and avenues for future research discussed.     

A functional marked point process model for lupus data

Modelling for marked point processes is an important problem, but has received remarkably little attention in the statistical literature. The authors developed a marked point process model that incorporates the use of functional data analysis in a joint estimation of the frequency function of the point process and the intensity of the mark, with application to data from 22 lupus patients consisting of times of flares in symptom severity combined with a quantitative assessment of the severity. The data indicate that a rapid decrease in drug dose is significantly associated with a decrease in flare frequency. Experiments with simulated data designed to model the actual data further support this conclusion. The Canadian Journal of Statistics 40: 517–529; 2012 © 2012 Statistical Society of Canada     

A maximum likelihood estimator for left-truncated lifetimes based on probabilistic prior information about time of occurrence

In forestry, many processes of interest are binary and they can be modeled using lifetime analysis. However, available data are often incomplete, being interval- and right-censored as well as left-truncated, which may lead to biased parameter estimates. While censoring can be easily considered in lifetime analysis, left truncation is more complicated when individual age at selection is unknown. In this study, we designed and tested a maximum likelihood estimator that deals with left truncation by taking advantage of prior knowledge about the time when the individuals enter the experiment. Whenever a model is available for predicting the time of selection, the distribution of the delayed entries can be obtained using Bayes' theorem. It is then possible to marginalize the likelihood function over the distribution of the delayed entries in the experiment to assess the joint distribution of time of selection and time to event. This estimator was tested with continuous and discrete Gompertz-distributed lifetimes. It was then compared with two other estimators: a standard one in which left truncation was not considered and a second estimator that implemented an analytical correction. Our new estimator yielded unbiased parameter estimates with empirical coverage of confidence intervals close to their nominal value. The standard estimator leaded to an overestimation of the long-term probability of survival.     

Is Workers' Compensation a Substitute for Unemployment Insurance?

This paper examines how the Workers' Compensation (WC) and Unemployment Insurance (UI) programs interact to influence the duration of claims due to workplace accidents. We use longitudinal WC administrative micro-data on more than 30,000 workers in the Canadian construction industry for the period 1976–1986. For the estimations, we use the Meyer (1990) semi-parametric proportional hazard model. Our results show, in particular, that a reduction in the UI replacement ratio is associated with an increase in the duration of claims due to severe accidents that are difficult to diagnose. Moreover, the duration of spells on WC is much higher when an accident occurs in December, a month which corresponds to the beginning of the lay-off season in the construction sector. This result is consistent with the fact that WC benefits are more generous than UI benefits in Canada.     

Enriching our understanding of vulnerability through the experiences and perspectives of individuals living with mental illness

ABSTRACT

Vulnerability is a central concept in research ethics and typically serves to identify individuals or groups whose participation in research prompts specific concerns or warrants special consideration. While theoretical discussions on vulnerability have contributed valuable insights to discussions of mental health research and care, they have not been enriched thus far by stakeholder perspectives. This oversight has important consequences for the ways in which we frame vulnerability. It misses the far-reaching insights and experiential knowledge of mental health research participants whose experiences this ethics concept ultimately seeks to capture. In view of this gap, our study combines a pragmatist ethics framework and interpretive phenomenological analysis of qualitative interviews to explore user perspectives on the notion of vulnerability through the lived experiences of mental health research participants and patient-advocates. Importantly, these perspectives offer essential clues to address the difficulties of operationalizing concerns for vulnerability in concrete and practical ways. They help refine our understanding of this key ethics concept.