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In estimating the eigenvalues of the covariance matrix of a multivariate normal population, the usual estimates are the eigenvalues of the sample covariance matrix. It is well known that these estimates are biased. This paper investigates obtaining improved eigenvalue estimates through improved estimates of the characteristic polynomial, which is a function of the sample eigenvalues. A numerical study investigates the improvements evaluated under both a square error and an entropy loss function. 相似文献
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Debra L. Mason 《Journal of Media and Religion》2015,14(3):123-127
This preface summarizes the emergence of religion and media courses from the 1950s to the present day. It makes the case for why analysis of religion and media coursework is a challenge and reports on research that shows enormous diversity among the types of courses commonly classified as within the “religion and media” subject. The preface furthermore summarizes the other articles in this special issue. 相似文献
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Interdisciplinary teamwork is the foundation for the delivery of hospice care. This project interviewed 23 hospice social workers by telephone to explore their experiences with hospice team collaboration. Two research questions were explored: (1) What do social workers perceive as the strengths of interdisciplinary collaboration and (2) What are the challenges for social workers on interdisciplinary hospice teams? Participants identified issues related to team process, administrative processes, and barriers to effective team collaboration. Collaboration was said to be fostered by good communication, trust, roles, joint visitation, respect, team building activities, and administrative interest and support. Challenges to collaboration included large caseloads, a focus on the medical model, limited visits, personality and team conflict. Opportunities for improved collaboration between social workers and hospice team members exist through active evaluation of collaboration and strategic initiatives aimed at improving collaboration. 相似文献
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Social workers are exposed to trauma vicariously through the trauma of their clients. This phenomenon, called secondary traumatic stress, vicarious traumatization, or compassion fatigue, presents a risk of negative personal psychological consequences. Based on a sample of 166 child welfare workers and using standardized measures, the study findings document the link between a personal history of primary trauma, childhood abuse or neglect, and the heightened risk for secondary traumatic stress in child welfare workers. 相似文献
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Debra J. Davidson 《The British journal of sociology》2019,70(2):442-462
Reflexivity is an important sociological lens through which to examine the means by which people engage in actions that contribute to social reproduction or social elaboration. Reflexivity theorists have largely overlooked the central place of emotions in reflexive processing, however, thus missing opportunities to enhance our understanding of reflexivity by capitalizing on recent scholarship on emotions emanating from other fields of inquiry. This paper explores the role of emotion in reflexivity, with a qualitative analysis of social responses to hydraulic fracturing in Alberta, Canada, utilizing narrative analysis of long‐form interviews with rural landowners who have experienced direct impacts from hydraulic fracturing, and have attempted to voice their concerns in the public sphere. Based on interviews with a selection of two interview participants, the paper highlights the means by which emotions shape reflexivity in consequential ways, beginning with personal and highly individualized emotional responses to contingent situations, which then factor into the social interactions engaged in the pursuit of personal projects. The shared emotional context that emerges then plays a substantial role in shaping outcomes and their implications for social stasis or change. This study exemplifies the extent to which reflexive processing in response to breaches in the social order can be emotionally tumultuous affairs, constituting a significant personal toll that many may be unwilling to pay. 相似文献
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