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Although heterogeneity across individuals may be reduced when a two-state process is extended into a multi-state process, the discrepancy between the observed and the predicted for some states may still exist owing to two possibilities, unobserved mixture distribution in the initial state and the effect of measured covariates on subsequent multi-state disease progression. In the present study, we developed a mixture Markov exponential regression model to take account of the above-mentioned heterogeneity across individuals (subject-to-subject variability) with a systematic model selection based on the likelihood ratio test. The model was successfully demonstrated by an empirical example on surveillance of patients with small hepatocellular carcinoma treated by non-surgical methods. The estimated results suggested that the model with the incorporation of unobserved mixture distribution behaves better than the one without. Complete and partial effects regarding risk factors on different subsequent multi-state transitions were identified using a homogeneous Markov model. The combination of both initial mixture distribution and homogeneous Markov exponential regression model makes a significant contribution to reducing heterogeneity across individuals and over time for disease progression. 相似文献
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Drawing on Judith Butler's conception of 'performativity', we would argue that the notion has important implications for contemporary debates in international social welfare over agency, subjection and 'resistance'. Professional social workers embedded in discursive institutions function according to particular expectations around performativity. In addition, this organisational context is complex with multiple demands. In light of technologies of surveillance and control in contemporary social work, performativity offers a response to the pressing need to expand notions of worker opposition beyond traditional forms of organised dissent towards the production of subjective space. 相似文献
75.
Tony Champion Mike Coombes 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2007,170(2):447-467
Summary. Human capital is increasingly being recognized as crucial to the sustained growth of British cities, and the population census is unrivalled as a source of data on the characteristics of people moving to and from cities. Taking advantage of new features in the 2001 census, the paper examines how successful 27 of Britain's largest cities and their regions are in maintaining their labour force complement, giving particular attention to young adults and people working in high level occupations. Considerable variation is apparent between city regions, but the interpretation of results is somewhat hampered by limitations in the census data, prompting recommendations for future data collection. 相似文献
76.
This article examines how the technical layout of some online platforms shapes the way individuals engage in public debate online. To do so, the research studies an empirical case of how public debating on Weibo—China's equivalent to Twitter—leads to opinion polarization. The technical layout of Weibo strongly influences how users debate with others. The thread‐based message structure fragments the interactional context, preventing users from gaining a clear picture about other discussants and the ongoing conversation. Weibo's technical design, which enables simultaneous interactions with multiple audiences (of which many users are unaware), further complicates the debates. Consequently, users become confused about their audience and where their replies are targeted, and subsequent interpersonal tension sparks as they adopt interactive strategies (sharing personal experiences, adding situational elaborations, and seeking solidarity through opinion) to reduce this confusion. Ironically, these strategies often serve to further polarize opinions. A video abstract is available at https://youtu.be/U5qdm6eiQ1M . 相似文献
77.
Robin G. Sawyer PhD Diane Fong CRNP Lisa R. Stankus CRNP Anne Anderson-Sawyer MA Kiabi D. Long Pregnancy Counselor BS 《Journal of American college health : J of ACH》2013,61(4):145-149
Abstract The authors examined the feasibility and effectiveness of a telephone follow-up procedure on use of emergency contraceptive pills (ECP) at a college health center. They made 264 telephone calls to the 97 women who had received ECPs during one 16-week academic semester and were successful in reaching 65 (67%) of the women, who responded with information about their experiences with ECPs. The women demonstrated a high rate of adherence to the medical regimen and reported very few side effects from ECPs; a majority said that ECPs did not affect their ability to carry out daily activities. On weighing the relative absence of problems following ECP distribution against the time, effort, and cost required to reach just over two thirds of the women, the researchers concluded that an ECP telephone follow-up procedure was neither cost-effective nor particularly useful. 相似文献
78.
Tony N. Brown 《Sociological spectrum》2013,33(3):377-392
The aim of this article is to encourage a research agenda that attends to methodological considerations regarding measuring self-perceived racial and ethnic discrimination in social surveys. Toward this end, the author compared validity of alternative measures of discrimination. The first measure asks whether something unfair or bad has happened because of race and ethnicity, whereas the second measure asks about generic unfair events independent of attribution to race or ethnicity. In a probability sample of 586 Black respondents living in the Detroit metropolitan area interviewed in 1995, it was found that the prevalence of self-perceived racial and ethnic discrimination depended on question framing. Moreover, different respondents were likely to respond affirmatively to explicit versus generic measures of discrimination; importantly, the mental health consequences of self-perceived racial and ethnic discrimination varied by question framing. The results confirmed that the prevalence, correlates, and psychological impact of self-perceived discrimination should be evaluated on the basis of measurement sensitivity. 相似文献
79.
Dating the decline of Christianity in Britain has a vital bearing on its explanation. Recent work by social historians has challenged the sociological view that secularization is due to long‐term diffuse social processes by asserting that the churches remained stable and popular until the late 1950s and that the causes of decline lie in the social and cultural changes associated with the 1960s. We challenge this interpretation of the evidence. We also note that much of the decline of the churches is explained not by adult defection but by a failure to keep children in the faith. Given the importance of parental homogamy for the successful transmission of religious identity, the causes of decline in one generation may well lie in the experiences of the previous generation. We focus on the disruptive effects of the 1939–45 war on family formation and use survey data to argue for a staged model of decline that is compatible with the conventional gradual view of secularization. 相似文献
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