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31.
The aggregation level of industries in the Danish macroeconomic model ADAM is examined using a new indicator of aggregation bias. The indicator is decomposed into contributions from the original industries, thereby clearly identifying the aggregation problems which caused the six industry groups of the older versions of ADAM to be disaggregated into the current 19 groups. An aggregation key minimizing the new bias indicator is found: from the microlevel of 64 industries, 18 ‘optimal’ industry groups are formed through ‘clustering’; these groups are very similar to the current ADAM groups. Altogether, the conclusions based on the new indicator closely resemble those reached through years of practical experience. 相似文献
32.
Michele Cincera 《Economics of Innovation and New Technology》2013,22(8):657-682
This paper aim at assessing the impact of R&D spillovers on firms’ economic performance as measured by productivity growth. The construction of R&D spillovers is based on Jaffe's methodology (1988, 1996) which associates econometrics and data analysis. The main objective of the paper is to extend Jaffe's methodology by examining alternative methods for measuring R&D spillovers and to test their impacts in terms of the robustness of results. In particular, the method used to classify firms into technological clusters as well as the metrics implemented to appreciate firms’ technological proximities which enter the construction of spillovers are further investigated. In addition to R&D spillovers, firms’ own R&D capital, labour and physical capital are estimated by means of a Cobb–Douglas production function. The data set consists of a representative sample of 625 worldwide R&D intensive firms over the period 1987–1994. 相似文献
33.
The inclusion of criteria related to the spatial patterns resulting from forest harvesting activities is an important component of forest planning. Harvesting operations are more efficient when the harvesting areas are clustered. Therewith, it is possible to reduce the displacement of machinery and costs related to construction and maintenance of the road network. In this context, the objective of this study was to evaluate different strategies for aggregating harvesting stands in a forest plantation. We applied two Goal Programming approaches aiming at aggregating harvesting stands and an Integer Linear Programming model for including road investments into strategic forest planning. 相似文献
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中国广告产业集群化发展的战略选择与制度审视 总被引:2,自引:0,他引:2
本文运用产业集群理论,阐述了中国广告产业集群化发展的现实必需及其战略意义。文章在审视中国广告产业现状的基础上,指出中国广告公司要实现对广告业发达国家的超越,必须创新广告产业发展路径,走专业化-专门化-集群化-规模化的产业发展之路,专业化和专门化是集群化发展的基础和保障,规模化是集群化发展的必然走向,而公共政策的制度供给则是广告产业集群化发展的迫切需求。 相似文献
36.
Companies seeking to expand abroad are faced with the complex task of screening and evaluating foreign markets. How can managers define, characterize, and express foreign market opportunity? What makes a good market, an attractive industry environment? National markets differ in terms of market attractiveness, due to variations in the economic and commercial environment, growth rates, political stability, consumption capacity, receptiveness to foreign products, and other factors. This research proposes and illustrates the use of two complementary approaches to preliminary foreign market assessment and selection: country clustering and country ranking. These two methods, in combination, can be extremely useful to managerial decision makers in the early stages of foreign market selection. 相似文献
37.
It is not uncommon to observe the published forecasts of economic commentators closely bunched together over long periods
of time. In our case, the phenomenon is observed for eight national panels of economists who report monthly forecasts. A framework
is developed that conveniently nests within it several simple, yet plausible forecasting rules, and allows us to explore the
extent of the clustering phenomenon.
First version received: June 1999/Final version received: February 2001 相似文献
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本文构建了城市化水平综合评价体系,并用统计软件SPSS13.0对所构建的指标体系进行主成分分析和聚类分析,在分析结果的基础上将赣州各县市按城市化水平高低分为3大类,并提出加快城市化水平的具体措施。 相似文献
40.
延边州城镇化空间结构差异研究 总被引:1,自引:0,他引:1
运用主成分—聚类分析和探索性空间数据分析(ESDA)方法,在ArcGIS和Geoda095i等软件平台上,对延边州的城市化水平及空间差异进行了定量分析。结果表明:单从非农业人口比重来看,延边州城市化水平较高,但城市化发展水平不均衡,空间差异较大;城市化综合因子的Moran’s I指数为-0.255呈现负的空间分散现象;8个县市之间的城市化空间差异也较大,存在"极化"等现象。针对结论提出相应的建议,期望能够为延边州城市化综合发展提供理论依据。 相似文献