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1.
城市化对供水河流水文序列的影响分析 总被引:2,自引:0,他引:2
以西安市降水序列为参照,利用累积滤波器和Kendall秩次相关检验法检验了西安市主要供水河流黑河、沣河、灞河年径流序列的趋势性;利用有序聚类分析法推估了城市用水和郊区农业、城镇用水对各序列的显著影响干扰年份。结果表明,城市化对西安市主要河流年径流序列的影响强度由大到小依次是灞河、黑河、沣河;1965年以前,城市河流山口以上年径流序列影响相对较大,1971-1980年时段,城市河流山口以下年径流序列影响较大;突变性分析得出:主要河流山口以上年径流序列干扰年份灞河出现在1948年,入渭河流年径流序列干扰点年份灞河出现在1981年,黑河出现在1979年。黑河、灞河出山年径流序列与入渭河年径流序列突变点移动表明,城市化对河流年径流序列的影响程度山口以上河段小于山口以下至入渭河段。 相似文献
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Recent theoretical developments in the domain of strategic groups, specifically those related to cognitive groups and strategic group identity, seem to suggest that strategic group membership is likely to be relatively stable over time and that firms in a strategic group co‐evolve. Yet appropriate data analytic approaches that use information about firms over time to identify stable strategic groups and their evolutionary paths have been lacking. To overcome such limitations, this research proposes a new clusterwise bilinear multidimensional scaling model that can simultaneously identify (1) the number of strategic groups, (2) the dimensions on which the strategic groups are based, and (3) the evolution of the strategy of these groups over time. Our discussion encompasses various alternative model specifications, together with model selection heuristics based on statistical information criteria. An illustration of the proposed methodology using data pertaining to strategic variables for a sample of public banks in the tristate area of New York, Ohio, and Pennsylvania across three time periods (1995, 1999, and 2003) identifies two underlying dimensions with five strategic groups that display very different evolutionary paths over time. Post hoc analysis shows pronounced differences in firm performance across the five derived strategic groups. This article concludes with a discussion of the implications of the findings, as well as potential future research directions. John Wiley & Sons, Ltd. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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公众期望与会计信息真实性的关联分析 总被引:1,自引:0,他引:1
公众对会计的期望与对会计行为的认识之间存在期望差距,基于不同期望水平对会计信息失真现象所作的分类揭示了会计信息真实性的内涵。通过公众期望与会计信息真实性的关联分析可以发现,加强公众与会计界的沟通理解以及强化会计信息失真的治理,是解决会计信息真实性问题的有效途径。 相似文献
5.
Testing measurement invariance using multigroup CFA: differences between educational groups in human values measurement 总被引:1,自引:0,他引:1
Holger Steinmetz Peter Schmidt Andrea Tina-Booh Siegrid Wieczorek Shalom H. Schwartz 《Quality and Quantity》2009,43(4):599-616
This article applies the testing procedures for measurement invariance using multigroup confirmatory factor analysis (MGCFA).
It illustrates these procedures by investigating the factorial structure and invariance of the Portraits Value Questionnaire
(PVQ, Schwartz et al.: J. Cross Cult. Psychol. 32(5), 519–542 (2001)) across three education groups in a population sample (N = 1,677). The PVQ measures 10 basic values that Schwartz postulates to comprehensively describe the human values recognized
in all societies (achievement, hedonism, self-direction, benevolence, conformity, security, stimulation, power, tradition
and universalism). We also estimate and compare the latent means of the three education groups. The analyses show partial
invariance for most of the 10 values and parameters. As expected, the latent means show that less educated respondents attribute
more importance to security, tradition, and conformity values. 相似文献
6.
经济增长与城乡居民收入——一个实证研究 总被引:1,自引:0,他引:1
文章借助VAR模型、协整理论及Granger因果关系检验等分析方法,研究了1985~2004年我国经济增长对居民收入的影响关系。结果表明经济增长与城镇居民收入之间存在显著的长期动态均衡关系,经济增长是城镇居民收入变动的Granger原因;但是经济增长与农村居民收入之间不存在长期均衡关系。经济增长与城乡居民收入的不同关系已发生质的差别。 相似文献
7.
This paper distinguishes a terrorist group’s survivability from its success. Terrorist groups succeed if they join the political process or achieve some of their goals. Based on a sample of 470 terrorist groups, we first estimate the determinants of groups’ ending and, conditional on their demise, we identify factors conducive to their success. We find that religious fundamentalist terrorist groups survive longer than left-wing, nationalist/separatist, or right-wing groups; but religious groups are less apt than other ideologies to attain their objectives or to join the political process. Larger groups survive longer and possess a better success prognosis. Within-country group competition is conducive to survival, but harmful to success. Controls include groups’ goals, groups’ strategic choices, and home country’s characteristics. Robustness tests disaggregate our success measure, provide panel estimates, and incorporate other controls. 相似文献
8.
《Research in Economics》2023,77(1):25-33
This paper studies how an optimal menu chosen by a social planner depends on whether agents receive imperfect signals about their true tastes (imperfect self-knowledge) or the properties of available alternatives (imperfect information). Under imperfect self-knowledge, it is not optimal to offer fewer alternatives than the number of different tastes present in the population, unless noise is infinite (agents have no clue about their true preferences). As noise increases, the social planner offers menu items that are closer together (more similar). However, under imperfect information, as noise increases, it could be optimal to construct a menu with more distinct alternatives, restrict the number of options, or, for some finite noise, offer a single item. 相似文献
9.
周梅妮 《贵州财经学院学报》2005,(5):31-35
赫克歇尔一俄林的生产要素禀赋理论作为主流经济学派理论在国际贸易理论总体系中的影响力是巨大和深远的。而新兴古典贸易理论的发展,为解释国内贸易和国际贸易提供了一个统一的理论内核。这一理论的完美框架和强大的现实解释力引人瞩目。其理论的核心在于该理论独特的分析工具:超边际分析方法。采用新兴古典经济学的超边际分析法,引入交易效率,对赫克歇尔-俄林的生产要素禀赋理论进行新的分析,可以得出很多有价值的结论。 相似文献
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本文以江西旅游业发展状况为基础,通过纵向和横向比较分析,充分认识江西旅游业在全国和中部省份的地位,运用比较分析法和投入产出法对江西旅游业的收入效应、创汇效应、产业关联效应、产业波及效应进行定量分析,最后提出提高江西旅游业经济效应的对策建议。 相似文献