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51.
Harry O. Posten Section Editor 《The American statistician》2013,67(2):112-114
Estimation of covariance components in the multivariate random-effect model with nested covariance structure is discussed. There are two covariance matrices to be estimated, namely, the between-group and the within-group covariance matrices. These two covariance matrices are most often estimated by forming a multivariate analysis of variance and equating mean square matrices to their expectations. Such a procedure involves taking the difference between the between-group mean square and the within-group mean square matrices, and often produces an estimated between-group covariance matrix that is not nonnegative definite. We present estimators of the two covariance matrices that are always proper covariance matrices. The estimators are the restricted maximum likelihood estimators if the random effects are normally distributed. The estimation procedure is extended to more complicated models, including the twofold nested and the mixed-effect models. A numerical example is presented to illustrate the use of the estimation procedure. 相似文献
52.
Harry O. Posten Section Editor 《The American statistician》2013,67(4):258-259
This article examines the probabilities of outcomes from rolling dice with the dimension 1 × 1 × r for various values of r. Experiments were conducted by school students and university students. The results of the experiments are given and the probabilities examined using a generalized linear model. Notes are also made about the value of the experiment in teaching the groups of students. 相似文献
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Topics in Microbial Risk Assessment: Dynamic Flow Tree Process 总被引:5,自引:0,他引:5
Microbial risk assessment is emerging as a new discipline in risk assessment. A systematic approach to microbial risk assessment is presented that employs data analysis for developing parsimonious models and accounts formally for the variability and uncertainty of model inputs using analysis of variance and Monte Carlo simulation. The purpose of the paper is to raise and examine issues in conducting microbial risk assessments. The enteric pathogen Escherichia coli O157:H7 was selected as an example for this study due to its significance to public health. The framework for our work is consistent with the risk assessment components described by the National Research Council in 1983 (hazard identification; exposure assessment; dose-response assessment; and risk characterization). Exposure assessment focuses on hamburgers, cooked a range of temperatures from rare to well done, the latter typical for fast food restaurants. Features of the model include predictive microbiology components that account for random stochastic growth and death of organisms in hamburger. For dose-response modeling, Shigella data from human feeding studies were used as a surrogate for E. coli O157:H7. Risks were calculated using a threshold model and an alternative nonthreshold model. The 95% probability intervals for risk of illness for product cooked to a given internal temperature spanned five orders of magnitude for these models. The existence of even a small threshold has a dramatic impact on the estimated risk. 相似文献
55.
Harry J. Van Buren III Bradley R. Agle 《International Journal of Value-Based Management》1998,11(2):159-177
Although considerable work has been done on the measurement of religious values and beliefs, little is understood about their
effect on managerial values and decision making. This paper reports on theoretical work by the authors identifying Christian
religious beliefs that might affect managerial decision making; it also reports the results of empirical work validating five
scales of religious beliefs that might affect managerial decision making. Future research directions are proposed.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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This paper presents new measures of technological and customer‐side relatedness constructed from widely available secondary data. Relatedness is a concept central to predicting the existence and nature of a relationship between corporate diversification and firm performance. Yet, finding appropriate measures has been an ongoing struggle. The widely used SIC‐based entropy measure has low construct validity, and survey‐based measures are hard to replicate across firms and industries and over time. The measures we develop significantly outperform established measures in explaining variation in firm performance across firms and over time, and both sources of relatedness are found to be independent and significant explanations of firm performance. 相似文献
59.
Harry Sminia 《国际管理评论杂志》2016,18(2):111-132
This paper assesses Andrew Pettigrew's contribution to management scholarship. This review addresses the process, content, and context of his research career. Chronologically, the process will be subdivided into three distinct phases: the period leading up to the establishment of the Centre for Corporate Strategy and Change, Pettigrew's time with the Centre, and Pettigrew's research since leaving the Centre. The content of Pettigrew's research focussed on big problems and emerging phenomena such as decision‐making, organisational culture, organisation development, strategic change, human resource management, competitiveness, new public management, boards of directors, innovative forms of organising, high‐performing research teams, and business schools. His contextualist methodology for process research will be explicated. Pettigrew's contribution will be contextualised by comparing it with contemporary research. The paper concludes that there is still a need not only to examine big problems and emerging phenomena but also to provide a processual understanding of management reality. There is a need to further develop process research methodologies such as Pettigrew's contextualism, especially with respect to process research methods. 相似文献
60.
Early intervention and holistic,relationship‐based practice with fathers: evidence from the work of the Family Nurse Partnership 下载免费PDF全文
This paper seeks to add to the literature on working with fathers by focusing on early intervention. It draws on research into fathers involved in a home visitation service delivered by the Family Nurse Partnership in England and evaluates the men's experiences of the intervention. The vulnerability of fathers was striking and many were helped to develop their practical skills and confidence in caring for their babies. The intervention was effective because of the quality time that was invested in developing relationships with fathers (as well as mothers), the focus on their strengths as well as areas for improvement and the skilled, therapeutically oriented, holistic approach through which the service was delivered. The ‘early’ nature of the help was crucial to its success because of how it so effectively tapped into the men's redefinition of themselves as caring fathers during pregnancy and following the birth. We argue that there is important learning here for social care and health services in general about how to engage men and promote fathers' capacities to care for their children. 相似文献