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171.
Paul K. H. Lin Dale O. Richards David R. Long Matthew D. Myers Joyce A. Taylor 《统计学通讯:模拟与计算》2013,42(6):711-725
Tables of multipliers necessary for computing the shortest confidence interval in situations involving the F-distribution are presented. Such situations are illustrated with several examples. 相似文献
172.
Labor migration and commerce between Sudan and Libya have long been features of livelihoods in Darfur. This paper describes the importance of historical trade and migration links between Darfur and Libya, and provides a background to the political and economic situation in Libya which has influenced opportunities for Sudanese migrant workers. A case study of the situation of the Darfurian migrants in Kufra (an oasis and transnational trade hub in southern Libya) illustrates how the recent Darfur conflict has affected migration patterns from Darfur and remittance flows in the opposite direction. Official estimates of Darfurian migrant workers in Libya were unavailable but were estimated to be between 150,000 and 250,000. The closure of the national border between Sudan and Libya in May 2003, largely a result of insecurity in Darfur, stopped the traffic of migrant workers between northern Darfur and southern Libya (which prevented the onward travel to Sudan of several thousand migrants in Kufra), and curtailed the well‐established trade routes, communications, and remittance flows. The current limited economic prospects for migrant workers in Libya, combined with the threat of detention, difficulties of return to Sudan, and loss of contact with and uncertainty about the fate of their families in Darfur, have created a sense of despair among many Darfurians. The paper concludes with a series of recommendations to improve the conditions of the Darfurian migrants in Libya, including an amnesty for illegal migrants, and also to ease the travel of migrants, promote communications between Libya and Darfur, and support the flow of remittances. 相似文献
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174.
Dale W. Jorgenson Richard J. Goettle Mun S. Ho Daniel T. Slesnick Peter J. Wilcoxen 《Journal of Policy Modeling》2008,30(4):603
In this paper we model U.S. labor supply and demand over the next 25 years. Despite the anticipated aging of the population, moderate population growth will provide growing supplies of labor well into the 21st century. Improvements in labor quality due to greater education and experience will also continue for some time, but will eventually disappear. Productivity growth for the U.S. economy will be below long-term historical averages, but labor-using technical change will be a stimulus to the growth of labor demand. Year-to-year changes in economic activity will be primarily the consequence of capital accumulation. However, the driving forces of economic growth over the long term will be demography and technology. 相似文献
175.
‘Consumer‐directed personal assistance’ has been a central tenet of the North American Independent Living Movement since its inception. There is, however, surprisingly little research that explores how consumer‐directed assistance gets played out in practice. We conducted a qualitative study that explored the relationships between disabled ventilator users and their personal support workers (PSWs) in supportive housing environments in Ontario, Canada. The results show that while all participants agreed that they adhered to the philosophies of ‘independent living’ embedded in ‘consumer‐directed personal assistance’, how this was understood and enacted varied considerably. Narrow interpretations focused on the task‐oriented aspects of PSWs’ work, while broader interpretations included interpersonal aspects of care, respect and mutuality. We discuss how a conceptualization of consumer‐directed personal assistance can be elaborated to accommodate a notion of ‘care’ while retaining the core tenets of the independent living philosophy. 相似文献
176.
Dale J. Marino 《Risk analysis》2006,26(1):185-201
Physical property values are used in environmental risk assessments to estimate media and risk-based concentrations. Recently, however, considerable variability has been reported with such values. To evaluate potential variability in physical parameter values supporting a variety of regulatory programs, eight data sources were chosen for evaluation, and chemicals appearing in at least four sources were selected. There were 755 chemicals chosen. In addition, chemicals in seven environmentally important subgroups were also identified for evaluation. Nine parameters were selected for analysis--molecular weight (MolWt), melting point (MeltPt), boiling point (BoilPt), vapor pressure (VP), water solubility (AqSOL), Henry's law constant (HLC), octanol-water partition coefficient (Kow), and diffusion coefficients in air (Dair) and water (Dwater). Results show that while 71% of constituents had equal MolWts across data sources, <3% of the constituents had equivalent parameter values across data sources for AqSOL, VP, or HLC. Considerable dissimilarity between certain sources was also observed. Furthermore, measures of dispersion showed considerable variation in data sets for Kow, VP, AqSOL, and HLC compared to measures for MolWt, MeltPt, BoilPt, or Dwater. The magnitude of the observed variability was also noteworthy. For example, the 95th percentile ratio of maximum/minimum parameter values ranged from 1.0 for MolWt to well over 1.0 x 10(6) for VP and HLC. Risk and exposure metrics also varied by similar magnitudes. Results with environmentally important subgroups were similar. These results show that there is considerable variability in physical parameter values from standard sources, and that the observed variability could affect potential risk estimates and perhaps risk management decisions. 相似文献
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Michael J. Lawler Dale Curry Jann Donnenwirth Mary E. Mangrich Tonya N. Times 《Journal of social service research》2013,39(3):402-412
ABSTRACT Transfer of learning (TOL) from training to the job was examined in two different populations of human services workers using the Transfer Potential Questionnaire (TPQ). A cross-validation study was conducted to explore commonalities and differences between public welfare (PW) professionals in California (n = 459) and Child Protective Services (CPS) social workers in Ohio (n = 598). The TPQ significantly correlated with perceived TOL for both training populations and added to the amount of TOL variance explained after controlling for participant satisfaction and perceived learning. Important TOL factors identified for both groups included perceived learning and application planning. Findings suggest TPQ is a valid predictor of TOL for both PW professionals and CPS social workers, supporting a shared construct relative to TOL across human services practice areas. Future research should explore additional TOL assessment methods and seek to further validate the TPQ with other populations of human services professionals. 相似文献
180.
Julie P. Martin Dale M. Stack Lisa A. Serbin Alex E. Schwartzman Jane Ledingham 《Social Development》2012,21(1):47-67
This study examined the contribution of maternal childhood histories of aggression and social withdrawal to the prediction of mother–child social problem solving in the next generation. Fifty‐seven women (M = 37.32 years), previously rated (on a version of the pupil evaluation inventory) by their peers during childhood on measures of aggression and withdrawal, discussed conflicts with their 9‐ to 13‐year‐old children. Problem‐defining statements, solutions, and resolution strategies were coded using an observational measure developed by the authors. Maternal childhood histories of aggression and withdrawal predicted poorly sophisticated solutions in both mothers and children as well as antisocial solutions in children. Histories of withdrawal predicted solitary solutions in children as well as less guidance and structure during decision making. Findings suggest that mothers who were withdrawn, and those aggressive and withdrawn in childhood, display less sophisticated problem solving, which may be mirrored in children. Results have implications for the development of aggressive and withdrawn girls into parenthood and highlight a potential pathway for the transfer of risk. 相似文献