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81.
82.
Decisions about social media in organizations are not made lightly. Corporate executives are faced with an ever changing and in many cases, uncontrollable opportunity with social media. This study provides insights obtained from 25 interviews with communication and public relations executives to identify their opinions about what drives social media in organizations, what challenges they face, and what questions they have about social media and its measurement. 相似文献
83.
Guillaume Rocheteau Randall Wright 《Econometrica : journal of the Econometric Society》2005,73(1):175-202
We compare three market structures for monetary economies: bargaining (search equilibrium); price taking (competitive equilibrium); and price posting (competitive search equilibrium). We also extend work on the microfoundations of money by allowing a general matching technology and entry. We study how equilibrium and the effects of policy depend on market structure. Under bargaining, trade and entry are both inefficient, and inflation implies first‐order welfare losses. Under price taking, the Friedman rule solves the first inefficiency but not the second, and inflation may actually improve welfare. Under posting, the Friedman rule yields the first best, and inflation implies second‐order welfare losses. 相似文献
84.
Likelihood ratio tests for the homogeneity of k normal means with the alternative restricted by an increasing trend are considered as well as the likelihood ratio tests of the null hypothesis that the means satisfy the trend. While the work is primarily a survey of results concerning the power functions of these tests, the extensions of some results to the case of not necessarily equal sample sizes are presented. For the case of known or unknown population variances, exact expressions are given for the power functions for k=3,4, and approximations are discussed for larger k. The topics of consistency, bias and monotonicity of the power functions are included. Also, Bartholomew's conjectures concerning minimal and maximal powers are investigated, with results of a new numerical study given. 相似文献
85.
Jean Acker Wright 《Serials Review》2013,39(1):103-104
86.
CONVERGENCE AND PREDICTION OF PRINCIPAL COMPONENT SCORES IN HIGH-DIMENSIONAL SETTINGS 总被引:1,自引:0,他引:1
A number of settings arise in which it is of interest to predict Principal Component (PC) scores for new observations using data from an initial sample. In this paper, we demonstrate that naive approaches to PC score prediction can be substantially biased towards 0 in the analysis of large matrices. This phenomenon is largely related to known inconsistency results for sample eigenvalues and eigenvectors as both dimensions of the matrix increase. For the spiked eigenvalue model for random matrices, we expand the generality of these results, and propose bias-adjusted PC score prediction. In addition, we compute the asymptotic correlation coefficient between PC scores from sample and population eigenvectors. Simulation and real data examples from the genetics literature show the improved bias and numerical properties of our estimators. 相似文献
87.
Timothy Dickinson Volkan Topalli Richard Wright 《The British journal of sociology》2023,74(4):624-637
In this study, we investigate the meanings active armed robbers give to money before, during, and after their crimes and how these meanings shape their offending. We do so by examining interviews undertaken from 1994 to 1995 with robbers in St. Louis, Missouri, USA. Prior to their robberies, the interviewees' desperation leads them to define money as essential to survival. Immediately following robberies and in looking back on them, they come to view this essential money in other ways as well—as too time-consuming to get, as “easy,” or as guilt-free. These meanings facilitate the contradictory way robbers see money as “fast” after offences. We discuss how these shifting meanings of money shape and are shaped by robbers' structural positions, cultural outlooks, and social relations. In doing so, we also help to explain how the shifting meanings of money play into criminogenic cycles of predatory offending. 相似文献
88.
89.
Lindsay Cole Angela Crettenden Rachel Roberts Annemarie Wright 《The Australian journal of social issues》2016,51(3):317-339
There are increasing numbers of families in Australia headed by sole parents, but little is known about the experiences of those who also care for a child with a disability. Additional caring responsibilities have previously been shown to impact on the work participation of parents. This study involved qualitative analyses of interview data conducted with sole mothers with school‐aged children with disability (N = 11). Thematic analysis revealed four themes that enabled and supported participation in the workforce: social support; managing appointments; characteristics of the workplace; and the role of the school. Results suggest the importance of practical help from family and friends in facilitating participation in paid employment. Additionally, the importance of flexible appointment scheduling on the part of service providers was highlighted, as well as the importance of workplace flexibility and supportive workplace cultures. Such factors were important in supporting sole mothers to balance work with care, with important implications for personal and family wellbeing. 相似文献
90.
Deena Mandell Carol Stalker Margriet de Zeeuw Wright Karen Frensch Cheryl Harvey 《Child & Family Social Work》2013,18(4):383-393
The authors conducted a mixed‐method study after a previous study of child welfare employees revealed a subgroup exhibiting surprisingly high levels of both emotional exhaustion (EE) and job satisfaction (JS). This subgroup included direct service workers, supervisors and managers. As these findings appeared to conflict with previous studies, we re‐reviewed the literature and undertook the current study to account for the co‐existence of EE and JS. We explored and compared this subgroup with two others: workers who found their work satisfying without experiencing high levels of EE and those whose high levels of EE were associated with low JS. Using a survey that included several standardized measures with 226 employees and semi‐structured interviews with a criteria‐based subsample of 25, we explored the role that personality, career expectations, coping styles, stage of life, education, gender and social networks play in outcomes for individual employees. Analyses of quantitative and qualitative data yielded a profile for each subgroup, offering insights into the subjective experiences of workers within individual, social and organizational contexts. These findings have implications for recruitment, training and support of child welfare workers. 相似文献