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111.
Many directional data such as wind directions can be collected extremely easily so that experiments typically yield a huge number of data points that are sequentially collected. To deal with such big data, the traditional nonparametric techniques rapidly require a lot of time to be computed and therefore become useless in practice if real time or online forecasts are expected. In this paper, we propose a recursive kernel density estimator for directional data which (i) can be updated extremely easily when a new set of observations is available and (ii) keeps asymptotically the nice features of the traditional kernel density estimator. Our methodology is based on Robbins–Monro stochastic approximations ideas. We show that our estimator outperforms the traditional techniques in terms of computational time while being extremely competitive in terms of efficiency with respect to its competitors in the sequential context considered here. We obtain expressions for its asymptotic bias and variance together with an almost sure convergence rate and an asymptotic normality result. Our technique is illustrated on a wind dataset collected in Spain. A Monte‐Carlo study confirms the nice properties of our recursive estimator with respect to its non‐recursive counterpart. 相似文献
112.
Thomas Parker 《统计学通讯:理论与方法》2017,46(11):5195-5202
In this note, it is shown that the finite-sample distributions of the Wald, likelihood ratio, and Lagrange multiplier statistics in the classical linear regression model are members of the generalized beta model introduced by McDonald and Xu (1995a). This is useful for examining the properties of these test statistics. For example, this characterization makes it easy to find distribution, quantile, and density functions for each test statistic, makes it clear why Wald tests may overreject the null hypothesis using asymptotic critical values, and formalizes the fact that the Lagrange multiplier statistic follows a distribution with bounded support. 相似文献
113.
Researchers have found that when young people participate in discussions of controversial political issues, they often become more politically engaged and informed (Hess, 2009). Nonetheless, some educators avoid fostering such discussions because they can become heated and distract from academic learning (Hess, 2002). Presidential elections, including the highly publicized debates, provide substantial material for discussions of major national and international issues, but no published research has examined how educators can leverage these events to generate productive civic learning experiences. In this article, we analyze data collected in seven high school classrooms during the 2012 presidential election to examine the challenges and opportunities associated with generating substantive, dynamic discussions of presidential debates. Our findings indicate that students enjoyed learning about candidates' different perspectives and that certain strategies were especially helpful for fostering substantive discussions: (a) scaffolding students' preparation for discussion; (b) providing opportunities for students to address open-ended questions; (c) redirecting students' engagement in competitive, interpersonal dynamics to learning about public issues; and (d) countering students' partisan tendencies. We discuss implications for practice and research and present a conceptual framework for generating dynamic, substantive democratic discussions. 相似文献
114.
The authors conducted an online survey of elementary teacher education programs within a large midwestern state to assess preservice teachers’ and teacher educators’ beliefs about and preparedness to teach financial literacy. Very few preservice teachers had meaningful experiences with personal finance in high school, college, or personal decision making. No teacher educators reported ever teaching financial literacy in their higher education roles. Only 13% of teacher educators and 25% of preservice teachers thought that it was very important to teach financial literacy in elementary education. Most teacher education faculty and preservice teachers reported that they were not well qualified to use state economics standards or the JumpStart standards for financial literacy. Preservice teachers were more confident in meeting financial literacy standards than teacher educators. Both preservice teachers and teacher educators expressed openness to collaborating with other faculty members, members of the financial service industry, and parents to teach financial literacy. Follow-up phone interviews affirmed that elementary preservice teachers and teacher educators value social studies education (and financial literacy) less than reading and mathematics education. Qualitative results also suggest that elementary preservice teachers and teacher educators would like more easily accessible resources for teaching financial literacy. 相似文献
115.
It's About Time! Examining Received Dosage and Program Duration as Predictors of Change Among Non‐Distressed and Distressed Married Couple and Relationship Education Participants 下载免费PDF全文
Angela B. Bradford Lauren Drean Francesca Adler‐Baeder Scott A. Ketring Thomas A. Smith 《Journal of marital and family therapy》2017,43(3):391-409
Although Couple and Relationship Education (CRE) programs were intended to be preventive in nature, an emerging reality is that relationally distressed couples are attending programs. This has raised questions about both its general usefulness and what is known regarding predictors of change in CRE for distressed couples particularly. Previous work has identified dosage and duration as important moderators of changes, and there are myriad program contexts offered, highlighting the need to examine these among distressed couples. This study utilized a sample of community CRE participants and examined received dosage and program duration as predictors of change. Comparing results for distressed and non‐distressed participants, we found several group differences. Findings suggest that it is important to consider distress level and time spent in programs when placing participants. In addition, research should continue to examine these groups separately (or comparatively) to find out what works for whom. 相似文献
116.
The existing literature on the determinants of income redistribution has identified a ‘paradox’. Namely, that countries with a high degree of market income inequality redistribute little, which is in disagreement with the median voter theorem. In a first step, this paper outlines several mechanisms that explain why government corruption might be partially responsible for this ‘paradox’. In a second step, different corruption perception indices and an instrumental variable approach are used to provide empirical evidence that indicates a significant negative impact of corruption on redistribution levels for a sample of 148 developing and developed countries. This finding suggests that, next to political and need factors, government corruption explains to some extent the ‘paradox of redistribution’. This is especially true for many developing countries, given that they typically have relatively high degrees of corruption and low levels of redistribution. 相似文献
117.
Pablo Cabrera-Barona Thomas Blaschke Stefan Kienberger 《Social indicators research》2017,133(2):719-739
Accessibility and satisfaction related to healthcare services are conceived as multidimensional concepts. These concepts can be studied using objective and subjective measures. In this study, we created two indices: a composite healthcare accessibility index (CHCA) and a composite healthcare satisfaction index (CHCS). To calculate the CHCA index we used three indicators based on three components of multidimensional healthcare accessibility: availability, acceptability and accessibility. In the indicator based on the component of accessibility, we included an innovative perceived time-decay parameter. The three indicators of the CHCA index were weighted through the application of a principal components analysis. To calculate the CHCS index, we used three indicators: the waiting time after the patient arrives at the healthcare service, the quality of the healthcare, and the healthcare service supply. These three indicators making up the CHCA index were weighted by applying an analytical hierarchy process. Three kinds of regressions were subsequently applied in order to explain the CHCA and CHCS indices: namely the Linear Least Squares, Ordinal Logistic, and Random Forests regressions. In these regressions, we used different independent social and health-related variables. These variables represented the predisposing, enabling, and need factors of people´s behaviors related to healthcare. All the calculations were applied to a study area: the city of Quito, Ecuador. Results showed that there are health-related inequalities in regard to healthcare accessibility and healthcare satisfaction in our study area. We also identified specific social factors that explained the indices developed. The present work is a mixed-methods approach to evaluate multidimensional healthcare accessibility and healthcare satisfaction, incorporating a pluralistic perspective, as well as a multidisciplinary framework. The results obtained can also be considered as tools for healthcare and urban planners, for more integrative social analyses that can improve the quality of life in urban residents. 相似文献
118.
Ross Deuchar Thomas Friis Søgaard Torsten Kolind Birgitte Thylstrup Liam Wells 《Journal of youth studies》2016,19(6):725-742
This paper draws upon international research evidence that suggests a relationship between protest masculinity and the manifestation of violent crime among young males, and that criminal desistance may be linked to (inter-) subjective processes such as the reconstruction of masculine identity. The paper considers the potential that pugilism (the art and practice of boxing) may have on enabling young, disadvantaged minority male gang members to find avenues for alternative identity construction and to gain transitional experiences which trigger self-confessed desistance actions. Drawing upon an ethnographic study conducted in a boxing rehabilitation centre on the outskirts of Copenhagen, Denmark, the paper reports on data gleaned from participant observation and qualitative interviews with 22 ethnic minority young men. Findings suggest that the masculine context within the rehabilitation programme provided the young men with a safe space to perform broader versions of locally dominated views on masculinity and to reflect on their current situations and dilemmas. The young men were clearly in transition and their desistance journeys were characterized by hope and ambition but also disappointment and despair. In some cases it appeared that the young men's dogged attempts to desist from crime became a new way for them to ‘do masculinity’. The authors draw upon the findings to make recommendations for policy, practice and research. 相似文献
119.
Thomas Aechtner 《Journal of Media and Religion》2016,15(2):78-99
The socio-religious skirmishes known as the Evolution Wars may have major implications for global religion, education, and popular perceptions of science. These so-called wars have witnessed the rise of several media-vocal proevolutionist organizations, which have sought to challenge Darwin-skeptic ideas and enterprises. Such proevolutionist organizations include the atheistic Richard Dawkins Foundation for Reason and Science, the religiously neutral National Center for Science Education, and the BioLogos Foundation Christian advocacy group. This study executes a content analysis of media produced by these leading proevolutionist organizations from 2009 to 2011 and gauges the occurrence rates of several persuasive cues associated with the Elaboration Likelihood Model. This exercise reveals ways in which certain persuasive elements are articulated throughout proevolutionist media, and juxtaposes these observations with data previously gathered concerning Darwin-skeptic materials. 相似文献
120.
Nicola K. Gale Gareth M. Thomas Rachel Thwaites Sheila Greenfield Patrick Brown 《Sociology Compass》2016,10(11):1046-1071
In this article, we define the concept of “risk work,” which aims to make visible working practices to assess or manage risk, in order to subject these practices to sociological critique. This article reviews and synthesizes existing published literature to identify components of risk work: (a) translating risk into different contexts, (b) minimizing risks in practice, and (c) caring in the context of risk. We argue that these three components of risk work raise important tensions for workers that have been inadequately explored in the literature to date. We propose that future research should additionally focus on practitioner subjectivity and identity in risk work. In addition, we argue that comparative research—across type of risk and different contexts—and methodological and theoretical diversity would enhance this emerging field of research. 相似文献