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81.
Longitudinal studies suffer from patient dropout. The dropout process may be informative if there exists an association between dropout patterns and the rate of change in the response over time. Multiple patterns are plausible in that different causes of dropout might contribute to different patterns. These multiple patterns can be dichotomized into two groups: quantitative and qualitative interaction. Quantitative interaction indicates that each of the multiple sources is biasing the estimate of the rate of change in the same direction, although with differing magnitudes. Alternatively, qualitative interaction results in the multiple sources biasing the estimate of the rate of change in opposing directions. Qualitative interaction is of special concern, since it is less likely to be detected by conventional methods and can lead to highly misleading slope estimates. We explore a test for qualitative interaction based on simultaneous confidence intervals. The test accommodates the realistic situation where reasons for dropout are not fully understood, or even entirely unknown. It allows for an additional level of clustering among participating subjects. We apply these methods to a study exploring tumor growth rates in mice as well as a longitudinal study exploring rates of change in cognitive functioning for Alzheimer's patients. 相似文献
82.
A two-phase approach for sampling with unequal inclusions probabilities and fixed sample size is presented. The expansion estimator using target inclusion probabilities is suggested for estimation of population parameters. As an alternative, the estimator for two-phase sampling can be used for estimation. Inclusion probabilities are shown to be asymptotically equivalent to the targeted inclusion probabilities. By means of simulation associated estimators are shown to work well with respect to bias and precision. 相似文献
83.
84.
Sharon Peterson PhD RD Diana Poovey Duncan MS RD Dawn Bloyd Null MS RD Sara Long Roth PhD RD Lynn Gill MS RD 《Journal of American college health : J of ACH》2013,61(5):425-431
Abstract Objective: Determine the effects of a short-term, multi-faceted, point-of-selection intervention on college students’ perceptions and selection of 10 targeted healthful foods in a university dining hall and changes in their self-reported overall eating behaviors. Participants: 104 college students, (age 18–23) completed pre-I and post-I surveys. Methods: Pre-survey collected at dining hall in April 2007, followed by 3-week intervention then post-survey collected via email. Healthy choice indicators, large signs, table tents, flyers and colorful photographs with “benefit-based messages” promoted targeted foods. Response rate to both surveys was 38%. Results: Significantly more participants reported that healthful choices were clearly identified in the dining hall after the intervention. Over 20% of participants reported becoming more aware of healthful food choices in the dining hall after the intervention. Significant increases in self-reported intake were reported for cottage cheese and low-fat salad dressing, with a trend toward increased consumption of fresh fruit. Seven of the 14 assessed eating behaviors had significant changes in the desired direction. Increased awareness of healthful foods was the top reason for self-reported changes in overall eating behaviors. Conclusion: Short-term, multi-faceted, point-of-selection marketing of healthful foods in university dining halls may be beneficial for improving college students’ perceptions and selections of targeted healthful foods in the dining hall and may improve overall eating behaviors of college students. 相似文献
85.
Sara Cohen 《Cultural Studies》2013,27(3):332-346
In this article I address the origins of America's national parks, particularly as they figure in the environmentalist discourse surrounding the institution of Yosemite Valley as a public park. Although technically speaking Yosemite did not become a national park until 1890, its cession to the State of California in 1864 provides an important cultural site for the emergence of environmentalism as part of a broader concern with the relations between aesthetic, social and natural agency. In mapping out these relations in Frederick Law Olmsted's 1865 report on the management of Yosemite, I claim that the preservation of Yosemite reproduces nature as a public park in which human agency can be simultaneously produced and elided by means of the aesthetic agency of nature. I read Olmsted's report as a discursive site on which we can trace the structural parallels between the preservation of Yosemite and several related cultural practices in which the origins of American environmentalism are embedded. I also read it as sketching out the configurations of human and natural agency within which these parallel practices are articulated. My study operates from the assumption that science and technology need to be understood not simply by explaining how they are socially or culturally constructed, but also by looking at how certain fundamental ideas of metaphors (like natural agency or the reproduction of nature) are worked out at the same historical moment in different discursive practices. In taking up the idea of America as it both defines and is defined by the network of relations among science, technology and culture, I outline certain myths of American environmentalist origins as played out across a number of diverse and heterogeneous discourses and technologies of representation and reproduction. I hope also to illuminate the way in which American cultural origins are simultaneously constructed and destabilized through the act of reproducing nature. 相似文献
86.
Betty J. Ruth Jamie Wyatt Marshall Esther E. M. Velásquez Sara S. Bachman 《Journal of Social Work Education》2013,49(1):186-194
Dual-degree programs in public health and social work continue to proliferate, yet there has been little research on master’s of social work (MSW)/master’s of public health (MPH) graduates. The purpose of this study was to describe and better understand the self-reported professional experiences, identities, roles, and outcomes associated with 1 group of graduates from an established MSW/MPH program. A 57-question electronic survey was administered to 214 alumni in 2010; the response rate was 71.4% (n = 153). Findings provide a snapshot of public health social work alumni experiences, including diverse employment opportunities, high career satisfaction, and a strong sense of reported public health and social work integration in the workplace. 相似文献
87.
This article examines multiple aspects of religion and the risk of marital dissolution with a life course lens. Relying on the Longitudinal Study of Generations (LSOG), 1971 to 2005, we explore the effects of religion on the risk of first marital dissolution. Using discrete time-logit analysis, we find that the effect of religion and religiosity on divorce and separation were not significant, after controlling for sociodemographic factors, such as gender, ethnicity, marriage cohort, education, presence of children, household income, and employment status. Our findings support exchange theory that emphasizes educational and financial resources as key factors in divorce rather than religion or religiosity. 相似文献
88.
This qualitative study intended to assess how intergenerational transformative family mediation is a resource in promoting and supporting coparenting during the transition of divorce. There were 2 goals: to assess parents’ perceptions of key topics of family mediation and to compare their perceptions concerning different moments of the intervention. Fifteen Italian parents were interviewed using an ad hoc semistructured interview. Data were analyzed using the textual analysis software T-LAB. Findings showed mediator, pragmatic aspects, and family relationships as the most salient aspects of mediation. Significant differences emerged among the beginning, the middle phase, and the end of this intervention. 相似文献
89.
90.
Javonda Williams Kathleen A. Bolland Lisa Hooper Wesley Church Sara Tomek John Bolland 《Journal Of Human Behavior In The Social Environment》2013,23(7):858-868
The current study examined how self-reported racial/ethnic identification of adolescents living in poverty may be related to significant societal events and seminal public figures. Data from a multiple cohort longitudinal study, conducted in Mobile, Alabama between 1998 and 2011, were used to examine the impact of Barack Obama's nomination and presidency on racial/ethnic identification. The results show that significantly more adolescents changed their self-reported racial/ethnic identification from White or Mixed-Race to Black or Mixed Race after the election than before. These results suggest that a distant public figure can serve as a role model with observable effects for adolescents. 相似文献