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21.
In this paper, we introduce a multilevel model specification with time-series components for the analysis of prices of artworks sold at auctions. Since auction data do not constitute a panel or a time series but are composed of repeated cross-sections, they require a specification with items at the first level nested in time-points. Our approach combines the flexibility of mixed effect models together with the predicting performance of time series as it allows to model the time dynamics directly. Model estimation is obtained by means of maximum likelihood through the expectation–maximization algorithm. The model is motivated by the analysis of the first database ethnic artworks sold in the most important auctions worldwide. The results show that the proposed specification improves considerably over classical proposals both in terms of fit and prediction. 相似文献
22.
We provide evidence on the existence of short-run trade diversion effects towards third countries as a consequence of tariff shocks. We exploit sudden policy changes in the context of the trade dispute between the United States and China in 2018. Based on a data set covering monthly product-level information on US imports from 30 countries for the period 2016 until May 2019, we employ a difference-in-differences estimation framework. Doing so, we can show a strong negative direct effect of US tariffs on US imports from China, but do not find evidence for significant short-run trade diversion effects towards third countries. 相似文献
23.
Achille Basile Anna De Simone Maria Gabriella Graziano 《Social Choice and Welfare》2005,25(1):127-139
We prove that the welfare theorems hold in the framework of coalitional exchange economies with public projects, both in case
of pure exchange and in the presence of production. The space of agents is assumed to be non-atomic (single traders are negligible)
and infinitely many commodities are allowed to be present on the market. 相似文献
24.
Simone Howells 《The Australian journal of social issues》1974,9(3):209-216
An outline is given of the changing attitude of the Australian community towards its responsibility for the care of young children vis á vis the rights of the parents. Canberra's various provisions for the day care of the under-fives is reviewed and the distinction is made between education facilities for the children and ‘child care’ for the benefit of the parents. Because there is no literature in the field of family day care—‘child minding’—a small survey was conducted. Data are presented covering the ages of the children, the composition of the minders' families, charges made, and the minders' and working mothers' attitudes towards the arrangements. In conclusion, some indication is given as to desirable standards for both day care and group care, and suggestions are made about areas for which community responsibility should be taken in the future. 相似文献
25.
Helen McLachlan Della Forster Michelle Newton Pamela McCalman Sue Kildea Fiona McLardie-Hore Gina Bundle Jennifer Browne Marika Jackomos Jacqueline Watkins Simone Andy Jeremy Oats Catherine Chamberlain Jane Freemantle Sue Jacobs Ngaree Blow Karyn Ferguson Susan Donath Helena Maher 《Women and birth : journal of the Australian College of Midwives》2018
26.
27.
This article illustrates the challenges of creating a faculty development program on technology through the presentation of experiences with one such program, the Virtual Guild. Using examples from the Virtual Guild, the authors focus on the areas of program design and faculty motivation. The discussion of program design involves selecting content and determining the program format. Motivational issues discussed include individual- and organizational-level factors, as well as the combined effect of these factors on faculty participation. 相似文献
28.
29.
This baseline study used data from a informant survey of 76 rural communities in Central Tunisia to construct, first, measures of rural poverty and ecological deterioration and, second, indices of the major institutional complexes in the region. Using factor analysis, the study identified five institutional dimensions: services, religious institutions, mechanized agriculture, irrigated agriculture and sedentary herding. These dimensions were then used as independent variables in a regression analysis of the two social indicators with the results that sedentary herding and religious institutions (negative) predict ecological problems, and the same two dimensions, with the addition of services (negative) predict poor housing. Compared to household survey baselines, this one is less expensive, simpler to analyze and provides an analytic picture of the institutional structure, in relation to key indicators, of a region. 相似文献
30.
Dr. Simone Chlosta Dipl.-Psych. Dorothea Kissel 《Zeitschrift für Betriebswirtschaft》2011,81(9):945-975
The survey at hand uses a sophisticated classification between derivative and original founders to demonstrate that the group of entrepreneurs consists of several distinct sub-groups or types. With the help of personality traits (Big Five) we examine the different entrepreneurial types. We also investigate how the interaction of personality and entrepreneurial type influences success. The analyses were conducted with a sample of franchise founders (derivative founders) and new business founders (original founders) in Germany. The results in relation to the entrepreneurial type support the distinction between groups as differences were found in personality traits. With respect to the prediction of success we identify interaction effects between personality and entrepreneurial type. 相似文献