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51.
Correlated data are commonly analyzed using models constructed using population-averaged generalized estimating equations (GEEs). The specification of a population-averaged GEE model includes selection of a structure describing the correlation of repeated measures. Accurate specification of this structure can improve efficiency, whereas the finite-sample estimation of nuisance correlation parameters can inflate the variances of regression parameter estimates. Therefore, correlation structure selection criteria should penalize, or account for, correlation parameter estimation. In this article, we compare recently proposed penalties in terms of their impacts on correlation structure selection and regression parameter estimation, and give practical considerations for data analysts. Supplementary materials for this article are available online. 相似文献
52.
Sowmya Rajan S. Philip Morgan Kathleen Mullan Harris David Guilkey Sarah R. Hayford Karen Benjamin Guzzo 《Population research and policy review》2017,36(6):903-928
Having an unintended birth is strongly associated with the likelihood of having later unintended births. We use detailed longitudinal data from the Add Health Study (N = 8300) to investigate whether a host of measured sociodemographic, personality, and psychosocial characteristics select women into this “trajectory” of unintended childbearing. While some measured characteristics and aspects of the unfolding life course are related to unintended childbearing, explicitly modeling these effects does not greatly attenuate the association of an unintended birth with a subsequent one. Next, we statistically control for unmeasured time-invariant covariates that affect all birth intervals, and again find that the association of an unintended birth with subsequent ones remains strong. This persistent, strong association may be the direct result of experiencing an earlier unintended birth. We propose several mechanisms that might explain this strong association. 相似文献
53.
Social work educators are responsible for ensuring that future practitioners are culturally competent and have the ability to work effectively with people from different backgrounds. The purpose of this article is to address the current limitations in measuring cultural competence and to report the results of a qualitative study examining stakeholders’ conceptualizations of the definition, educational process, and evaluation of cultural competence in social work education. Findings support long-standing assumptions in the literature regarding the need for social workers to develop certain knowledge and attitudes as prerequisites of becoming culturally competent, and emphasize the need for further exploration of the way social workers define cultural competence, translate it into discrete practice behaviors, and assess how students demonstrate these behaviors. 相似文献
54.
Young graduates in England often return to the parental home after a period of living away during their university studies. Little is known, however, about why they return and how coresidence with parents fits within a life trajectory. This paper reports upon an in-depth cross-sectional qualitative study of young graduates’ coresidence with their parents. It identifies a five-part typology of the purpose of coresidence as perceived by the graduates: a base camp for exploration before settling into adulthood; a launch pad for careers; a savings bank, in particular for future property purchases; a refuge for respite and reflection; and a preferred residence, whether on account of comfort, cultural practice or to support parents. The paper further explores how far these purposes were associated in young adults’ accounts with social structures, individual agency or some combination of these. It concludes that the default understanding of graduates’ return and coresidence as a residual function when other options fail is insufficient. Such a generalisation obscures the different purposes which the return can enable; it overplays some notion of a broken biography rather than the positive contribution of coresidence to graduates’ trajectories towards adulthood and to their life experiences. 相似文献
55.
Philip Kasinitz 《Sociological Forum》2012,27(3):579-590
Controversies about international migration expose the changing structure of and underlying assumptions about societal membership in many nations. The sociology of international migration has emerged as an increasingly important subfield over the past decade in large part because it has tended to move beyond more narrow economic and demographic problems and has begun to address this fundamentally sociological issue. In the future it will be particularly important that sociologists pay attention to how demographically changing societies define who is and is not a member. As such, legal status and the role of the state has become critically important. 相似文献
56.
Does Higher Education Cause Religious Decline?: A Longitudinal Analysis of the Within‐ and Between‐Person Effects of Higher Education on Religiosity 下载免费PDF全文
Philip Schwadel 《The Sociological quarterly》2016,57(4):759-786
Although there is ample empirical evidence of the associations between higher education and various aspects of religiosity, the causal mechanisms producing these associations remain unclear. I use four waves of longitudinal data, with respondents ranging in age from 13 to 29, to model the within‐ and between‐person effects of higher education on several measures of religiosity. The results show that earning a bachelor's degree is associated with within‐person declines in some but not all measured aspects of religiosity, which partially supports the argument that higher education causes religious decline. The results also suggest that those predisposed to attending religious services self‐select into higher education, that relatively religious youth in general self‐select into nonelite colleges, and that those with low levels of religious belief self‐select into elite universities. These findings further understanding of the associations between social class and religion, particularly the causal effects of higher education. 相似文献
57.
Using data for U.S. counties from 2005 to 2012, we test whether higher levels of economic diversity mediated the effects of the Great Recession via four measures of stability. Spatial spillover effects are modeled by the use of the spatial Durbin estimator with heteroscedastic errors. The data generally support the central hypothesis that higher levels of diversity within a county are associated with enhanced employment stability across all counties as well as subsets of metro and nonmetro counties. Results for wage stability, however, appear to contradict our other findings. We suggest that underlying labor elasticities can bridge these apparent contradictory results. (JEL R11, R12, O47) 相似文献
58.
The Japanese “just-in-time with kanban” technique reduces in-process inventory to absolute minimal levels, in concert with the Japanese belief that inventory is an unnecessary evil. Due to the success of Japanese firms that employ this type of system, American firms would like to import this technique and emulate Japanese successes. But this Japanese success may be attributable not only to the just-in-time with kanban technique but also to the production environment in which the technique is employed. This paper simulates the just-in-time with kanban technique for a multiline, multistage production system in order to determine its adaptability to an American production environment that might include such characteristics as variable processing times, variable master production scheduling, and imbalances between production stages. The results have practical implications for those firms considering adoption of the Japanese technique. 相似文献
59.
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