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51.
Gareth O. Roberts & Jeffrey S. Rosenthal 《Journal of the Royal Statistical Society. Series B, Statistical methodology》1999,61(3):643-660
We analyse theoretical properties of the slice sampler. We find that the algorithm has extremely robust geometric ergodicity properties. For the case of just one auxiliary variable, we demonstrate that the algorithm is stochastically monotone, and we deduce analytic bounds on the total variation distance from stationarity of the method by using Foster–Lyapunov drift condition methodology. 相似文献
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Giovanna Miritello Esteban Moro Rubén Lara Rocío Martínez-López John Belchamber Sam G.B. Roberts Robin I.M. Dunbar 《Social Networks》2013
We used a large database of 9 billion calls from 20 million mobile users to examine the relationships between aggregated time spent on the phone, personal network size, tie strength and the way in which users distributed their limited time across their network (disparity). Compared to those with smaller networks, those with large networks did not devote proportionally more time to communication and had on average weaker ties (as measured by time spent communicating). Further, there were not substantially different levels of disparity between individuals, in that mobile users tend to distribute their time very unevenly across their network, with a large proportion of calls going to a small number of individuals. Together, these results suggest that there are time constraints which limit tie strength in large personal networks, and that even high levels of mobile communication do not fundamentally alter the disparity of time allocation across networks. 相似文献
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Siwan Roberts Rhiannon Fyfield Eugenia Baibazarova Stephanie van Goozen John F. Culling Dale F. Hay 《Infancy》2013,18(Z1):E1-E15
In a prospective longitudinal study of a representative community sample (N = 264), mothers' references to infants' mental states were coded during a topic‐sharing task in the home at 6 months. Joint attention behaviour was assessed in the laboratory at 12 months. Individual joint attention skills (gaze following, gaze alternating, and declarative pointing) were significantly inter‐correlated, with a single factor accounting for 68% of the variance. Mothers' references to infants' mental states at 6 months predicted infants' joint attention at 12 months. The association was not explained by sociodemographic characteristics of the family, the mother's mental state, or by the quantity or acoustic properties of her speech. However, variability in pitch of maternal speech was an independent predictor of the infants' later joint attention skills. Taken together, these findings suggest that mothers' infant‐directed speech fosters infants' attentive participation in topic‐sharing interactions, which in turn provide an important arena in which joint attention skills develop over the first year of life. 相似文献
56.
ABSTRACTSexual harassment, unlike rape, is a project of leisurely objectification that depends, for its erotic charge, on the perversion of consent. Unlike rape, where consent is vanquished, or erotic mutuality, where it is ratified, the pleasure of sexual harassment is that “consent” is coerced, that is, it is “consent” under duress. Under these conditions, which slowly dismantle the personhood of the victim, the issue becomes one of reality testing. “Just say no” is not an option when the question at hand is “What just happened?” 相似文献
57.
Niko Kargas Kathryn M. Harley Amanda Roberts Stephen Sharman 《Journal of Social Distress and the Homeless》2013,22(2):90-95
ABSTRACTRecent research suggests a high prevalence rate of Autism Spectrum Conditions (ASC) amongst the homeless population. Although, it is well-documented that autistic people experienced many barriers to accessing health services, little is known about their challenges in accessing homeless services. Thus, the present study aimed to measure prevalence of high levels of autistic traits, and to identify barriers that prevent autistic people accessing homeless services. Participants recruited from homeless services (n?=?65) completed the Autism Quotient-10 (AQ-10) alongside a questionnaire regarding perceived accessibility of homeless services. Results revealed that 18.5% of participants scored Above the Clinical Threshold of the AQ-10 (ACT-AQ). Moreover, the ACT-AQ group reported that encountering big groups in shared accommodation represent a significant barrier to engaging with homeless services. Further research is needed to identify the full degree of ASC representation and the factors that might prevent autistic homeless people accessing homeless services, and thus overcoming homelessness. 相似文献
58.
Urban development either eliminates, or severely fragments, native vegetation, and therefore alters the distribution and abundance of species that depend on it for habitat. We assessed the impact of urban development on bird communities at 121 sites in and around Perth, Western Australia. Based on data from community surveys, at least 83 % of 65 landbirds were found to be dependent, in some way, on the presence of native vegetation. For three groups of species defined by specific patterns of habitat use (bushland birds), there were sufficient data to show that species occurrences declined as the landscape changed from variegated to fragmented to relictual, according to the percentage of vegetation cover remaining. For three other groups (urban birds) species occurrences were either unrelated to the amount of vegetation cover, or increased as vegetation cover declined. In order to maximise the chances of retaining avian diversity when planning for broad-scale changes in land-use (i.e. clearing native vegetation for housing or industrial development), land planners should aim for a mosaic of variegated urban landscapes (>60 % vegetation retention) set amongst the fragmented and relictual urban landscapes (<60 % vegetation retention) that are characteristic of most cities and their suburbs. Management actions for conserving remnant biota within fragmented urban landscapes should concentrate on maintaining the integrity and quality of remnant native vegetation, and aim at building awareness among the general public of the conservation value of remnant native vegetation. 相似文献
59.
Theresa L. Roberts 《Journal Of Human Behavior In The Social Environment》2013,23(7-8):565-574
ABSTRACTThis case study recounts and analyzes the journey that graduate students, enrolled in an experiential, interdisciplinary health promotions course, took with a diverse, urban, Black, Midwest community. Community members, faculty, and graduate students in social work and public health were fellow travelers on this voyage into uncharted territory. A major goal of the journey was to teach students how to recognize community strengths and to facilitate the community in using those strengths. The learner’s stance is used as the guiding principle for this reflective journey that generated serendipitous benefits and challenges. The article concludes with recommendations for interdisciplinary education and curriculum development. 相似文献
60.
Maria Roberts‐DeGennaro Christine Brown Jong Won Min Marci Siegel 《Social Work Education》2013,32(3):327-342
An online support site was constructed for graduate social work students at San Diego State University in California during their first‐year field practicum. A study was conducted to explore and describe the attitudes of these students toward the usefulness of the site's online features. Students participated in the site through the Blackboard Software Platform by adding discussion threads to asynchronous forums on an online discussion board, receiving information through online announcements, accessing field‐related materials through the site, and engaging in an online network. The most useful forum was related to the learning plan that students were required to complete in planning and organizing their field practicum experience. Students reported that the most useful feature of the site was the ability to access timely information through the online announcements from the Field Education Program. 相似文献