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1.
In a smoothing spline model with unknown change-points, the choice of the smoothing parameter strongly influences the estimation of the change-point locations and the function at the change-points. In a tumor biology example, where change-points in blood flow in response to treatment were of interest, choosing the smoothing parameter based on minimizing generalized cross-validation (GCV) gave unsatisfactory estimates of the change-points. We propose a new method, aGCV, that re-weights the residual sum of squares and generalized degrees of freedom terms from GCV. The weight is chosen to maximize the decrease in the generalized degrees of freedom as a function of the weight value, while simultaneously minimizing aGCV as a function of the smoothing parameter and the change-points. Compared with GCV, simulation studies suggest that the aGCV method yields improved estimates of the change-point and the value of the function at the change-point. 相似文献
2.
Lauren M. Amaro Nataria T. Joseph Theresa M. de los Santos 《Journal of Family Communication》2019,19(2):144-156
New mothers frequently seek information and community on social networking sites as they seek to establish their parenting practices. As social networking sites for mothers (SNSM) present an environmental influence on the family system, a mother’s experience with social comparison, belonging, and emotion on SNSM can bear significant influence over her satisfaction with her parenting. The present study utilized survey methods to explore mothers’ (n= 336) reported experiences of these variables. We use structural equation modeling to specify a model with good fit, which indicated that greater downward comparison directly related to greater parenting satisfaction, with belonging and negative emotion as mediating indirect relationships. Implications for family communication and mothers’ SNSM practices are discussed. 相似文献
3.
This issue examines struggles over public discursive power in late modern society, understanding that late modern publics are characterized by a destabilization of formerly unmarked public authorities, in other words, an unsettling of standardized “voices from nowhere” (Gal & Woolard, 2001). The contributions to the issue illustrate traditional social and academic elites’ discursive reactions to such developments. In the introduction, we outline different theoretical frameworks of modern and late‐modern publics, identify factors that contribute to a destabilization of modern certainties of social public order, and argue that a weakening of traditional public norms not only implies emancipation but also, as the contributions to the issue demonstrate, may bring along new forms of public dominance. For the positioning of contemporary sociolinguistic theory and practice, we conclude that it is the crucial task of the current public moment to critically self‐engage with our own relations with, and ideologies of, the public. Dieses Themenheft befragt Strukturen öffentlicher Diskursmacht in spätmoderner Gesellschaft und zeigt auf, dass spätmoderne Öffentlichkeit durch eine Destabilisierung von vormals unmarkierten Autoritäten ist, in anderen Worten, von standardisierten “voices from nowhere” (Gal & Woolard, 2001). Die Beiträge illustrieren Reaktionen traditioneller sozialer und akademischer Eliten hierauf. In dieser Einleitung skizzieren wir verschiedene theoretische Zugänge zu moderner und spätmoderner Öffentlichkeit, identifizieren Faktoren, die zu einer Destabilisierung von sozialen Gewissheiten der Moderne beitragen und legen dar, dass eine Schwächung traditioneller öffentlichen Normen nicht nur soziale Emanzipation impliziert sondern, wie die Beiträge zu diesem Heft zeigen, auch neue Formen öffentlicher Dominanz hervorbringt. In Bezug auf zeitgenössische soziolinguistische Theorie und Praxis schlussfolgern wir daraus, dass es im aktuellen öffentlichen Kontext eine zentrale Aufgabe der Soziolinguistik ist, sich kritisch mit den eigenen Beziehungen zu und Ideologien von Öffentlichkeit befassen. Das Themenheft soll zu dieser Auseinandersetzung beitragen. 相似文献
4.
Gender inequality within the university is well documented but proposals to tackle it tend to focus on the higher ranks, ignoring how it manifests within precarious work. Based on data collected as part of a broader participatory action research project on casual academic labour in Irish higher education, the article focuses on the intersection of precarious work and gender in academia. We argue that precarious female academics are non‐citizens of the academy, a status that is reproduced through exploitative gendered practices and evident in formal/legal recognition (staff status, rights and entitlements, pay and valuing of work) as well as in informal dimensions (social and decision‐making power). We, therefore, conclude that any attempts to challenge gender inequality in academia must look downward, not upward, to the ranks of the precarious academics. 相似文献
5.
The relevance of institutional arrangements concerning the German school system for social inequalities remains comparatively unclear, due to the prevalent use of only simple and mostly static categories. The present study adds to this debate and analyses the effect of different regulations at the transition to upper secondary schools on educational achievement and social inequality. Duration of primary schooling and tracking recommendations are taken into account. Empirical analyses are based on information of the related Education Acts (1985–2010) as well as data from the German Socio-Economic Panel Study (SOEP). This approach constitutes a significant advancement as it allows for an overall identification of changes in the institutional features between and within states. Results indicate that children who attend primary schools that cover six instead of four years are more likely to be enrolled in an academic-track Gymnasium. These effects are especially strong for children with lower social background. There is no significant difference between secondary school systems with overall pure early tracking and school systems with fewer school tracks and delayed tracking in the sense that only students who don’t attend upper secondary school aren’t tracked after the fourth grade. Furthermore, the results reveal that the relative importance of (mandatory) track recommendations tends to be lower for children of parents with higher socioeconomic status, even if children in general are more likely to attend the Gymnasium at age 15, when the parents’ freedom of choice isn’t restricted by teachers’ recommendations. 相似文献
6.
7.
This study utilized both quantitative and qualitative approaches to examine perceptions of aging among rural-dwelling senior citizens (203 women and 112 men), ages 65 and older. Quantitative results revealed that, despite no significant gender differences in the total number of medical conditions reported, women were less likely than men to report that health problems interfered with their daily functioning. Qualitative analyses revealed that women were particularly like to identify relationships, frame of mind, participating in activities, and religion/spirituality as important contributors to successful aging. 相似文献
8.
Representations are obtained for the probabilities that a Strict Borda Paradox and a Strong Borda Paradox are observed for
large electorates with three candidates under the standard assumptions of Impartial Culture and Impartial Anonymous Culture.
These representations are obtained for general weighted scoring rules (WSRs), and the probabilities are found to be maximized
for voting rules like plurality rule and negative plurality rule. It is found that these paradox probabilities are not reduced
for every scoring rule with the introduction of some degree of dependence among voters’ preferences with IAC. It is concluded
that actual observances of a Strict Borda Paradox should be extremely rare, and that while observances of a Strong Borda Paradox
should also be rare, they might occasionally be witnessed. 相似文献
9.
10.
Amélie Desvars-Larrive Mario Baldi Theresa Walter Richard Zink Chris Walzer 《Urban Ecosystems》2018,21(5):951-964
Nowadays, the majority of human beings live in urban ecosystems, with this proportion expected to continue increasing in the future. With the growing importance of urban rat-associated issues (e.g. damages to urban infrastructures, costs of rat-control programs, rat-associated health risks), it is becoming indispensable to fill the identified gaps in knowledge on the urban brown rat regarding, among others, its density, home range, genetic structure, and infectious status. In this context, live-trapping is a crucial prerequisite to any scientific investigation. This paper assesses the main constraints and challenges regarding the urban field and describes the major steps to be considered when planning research on urban rats. The primary challenges are i) the characterization of the urban experimental unit; ii) the choice of a trapping design: the use of live-trapping in capture-mark-recapture design, in association with modern statistics, is highly recommended to answer ecological questions (although these methods, mostly developed in natural ecosystems, need to be implemented for the urban field); iii) the potential ethical considerations with regard to animal welfare and field-worker safety; iv) the building of mutually-beneficial collaborations with city stakeholders, pest control professionals, and citizens. Emphasis must be put on communication to the public and education of field-workers. One major need of modern urban rat research is a peer-validated field methodology allowing reproducibility, repeatability, and inference from urban field studies and enabling researchers to answer long-standing key questions about urban rat ecology. 相似文献