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排序方式: 共有502条查询结果,搜索用时 15 毫秒
1.
This paper considers a Lagrange multiplier (LM) based panel unit root test that allows for heterogeneous structural breaks in both the intercepts and slopes of a series. We note that many popular time series variables are likely to exhibit changing means and/or trends over time. Given that the usual tests will depend on the nuisance parameters indicating the locations of the trend breaks, we adopt a transformation procedure that makes our new panel unit root tests invariant to the nuisance parameters. To illustrate the importance of the power gain provided by our test, we examine the convergence hypothesis using relative ratios of per capita health care expenditures in 20 OECD countries. Our results provide evidence that the convergence hypothesis is supported.  相似文献   
2.
本文首先从理论上深刻剖析了房地产泡沫与银行信贷规模相互之间的作用与传导机制,在此基础上选取2006年-2018年相关指标的年度数据,对房地产泡沫与银行信贷规模进行了图形拟合与周期性波动规律分析,分析发现二者存在极高的契合度。建立房地产泡沫的函数,构建协整方程实证发现银行信贷规模对房地产泡沫的长期弹性系数为0.51,从长期来看银行信贷规模每增加1%,房地产泡沫也相应增加0.51%,进一步建立VAR模型实证发现房地产泡沫与银行信贷规模互为格兰杰因果关系,二者相互影响、相互促进。通过方差分解实证发现银行信贷规模对房地产泡沫的变动具有重要的影响,另一方面,房地产泡沫是影响银行信贷规模变动最主要的因素。  相似文献   
3.
The study ascertained the impact of the Fast Track Land Reform Programme (FTLRP) in Zimbabwe on tobacco production. The Chow Test, Vector Error Correction Model (VECM) and the Vector Error Granger-Causality Test were applied. The results reveal that there was a structural break in tobacco sales in the year 2000. Furthermore, in the long-run, area under tobacco production had a positive impact whilst number of tobacco producers had a negative impact on tobacco sold pre-FTLRP. Post-FTLRP, area of tobacco and number of tobacco producers had negative impact. In addition, the FTLRP induced an 8.94 % increase in the speed of adjustment in correcting the long-run equilibrium in tobacco sales. In the short-run, the FTLRP caused a percentage increase in the area of tobacco production and number of tobacco producers to induce a 0.65 % and 0.76 % increase in the tobacco sales, respectively. Area of tobacco production and number of tobacco producers Granger-caused tobacco sales in the pre-FTLRP period. Post-FTLRP, the number of tobacco growers Granger-caused tobacco sales. It is concluded that the FTLRP had an impact on tobacco sales, mainly through the number of tobacco growers. The study recommends the specialisation and training of the new farmers to improve productivity.  相似文献   
4.
Using unique data from Hungary, the gap in reading and mathematics test scores between Roma and non‐Roma 8th grade students is assessed and a substantial gap between them revealed. Standardized test scores as well as the fraction of students with competences considered inadequate are examined. Regardless of measurement and subject area, the bulk of the gap is explained by social differences in income, wealth and parental education. Using reduced‐form regressions, two major mediating mechanisms are identified: first, on average the home environment of Roma children is less favourable for cognitive development; second, the educational environment of the average Roma student is different from the average non‐Roma student. Comparing students with similar home environments from the same school and class, the ethnic gap in test scores is found to be insignificant. Ethnic differences in the home environment are explained by social disparity, and ethnicity seems to play no additional role in that regard. The unequal distribution of Roma students in schools and classes is found to be explained predominantly by social difference, too, with a significant residual portion, indicating the effect of ethnic segregation.  相似文献   
5.
黑胚小麦病又被称为小麦黑点病,是一种在小麦胚或其他部位出现变色的病害。文章主要论述了我国在新形势下对黑胚小麦病的研究及其流行规律和病因,同时阐述了新疆粮油产品质量监督检验站在应对黑胚小麦病上的检验措施。  相似文献   
6.
对于世界经济不平衡与金融危机的关系,存在两种不同的观点:一种观点认为世界经济不平衡是金融危机产生的根源,顺差国庞大的过剩储蓄最终引发了金融危机;而另一种观点则认为愈演愈烈的世界经济不平衡却并不必然造成金融危机,而是同金融危机一样,根源于美国国内经济的某些扭曲。两者差别在于将危机的根源归于外因还是内因。本文通过理论分析与格兰杰因果实证检验,否定了危机根源外部论,并证明了后一种观点:美国房地产泡沫(美国国内经济扭曲的重要表现)在造成金融危机的同时,促进了世界经济不平衡的扩大。  相似文献   
7.
Abstract

Attitudes are at the heart of the Theory of Reasoned Action (TRA), but problems in defining and measuring attitudes have contributed to typically low ability to predict behaviour. This article investigates the impact of potential disjuncture between evaluations that an individual externally verbalises (explicit attitudes), and evaluations that are internally held and may exist outside of conscious awareness (implicit attitudes), on the predictive ability of TRA. We study consumers’ attitudes towards eating healthy food and subsequent behaviour in a context of socially consensual behaviour. An Implicit Association Test (IAT) is used to measure implicit attitudes, and these scores are contrasted with self-reported explicit attitude scores. Ninety one participants took part in the study. We found, surprisingly, that implicit attitude has no significant effect on behavioural intention. However, a disjuncture between an individual’s implicit and explicit attitudes, reflecting internal psychological conflict, affected behaviour.  相似文献   
8.
系统以MSP430F149单片机为主控电路。采用LM2599DC-DC升压电路和多个LM2940稳压,采集接负载电压、电流,通过单片机内部进行A/D转换,用LCD12864显示所测数值。系统由直流稳压电源电路、开关切换电路、漏电流保护电路、主控电路、显示电路构成。系统实现设计要求输出电压、电流;电压调整率小;负载调整率小;实时显示所测数值;漏电保护装置动作电路误差绝对值小、接入功耗小。  相似文献   
9.
大学生创业能力研究对建设创业型经济、完善高校教育体系和促进人的全面自由发展具有重要意义。通过理论与文献梳理,结合个案访谈结果,将大学生创业能力划分为机会发掘能力、组织管理能力、战略决策能力、资源整合能力、创新创造能力和挫折承受能力6个维度。根据因子内涵定义和相关学者研究成果,设计了大学生创业能力测量量表,并对江苏省高校进行了实证数据采集,验证了大学生创业能力结构的信度和效度。  相似文献   
10.
对欧盟轮胎滚动噪声技术法规的主要技术内容进行了研究,阐明了欧盟轮胎滚动噪声的分级及标签、噪声限值等技术要求,分析了轮胎滚动噪声的产生机理、影响因素和轮胎滚动噪声测试方法。建议为应对欧盟技术壁垒,应建设我国自己技术领先的轮胎试验场,开展轮胎滚动噪声性能测试和分析;改进轮胎设计和生产工艺,进一步提升我国轮胎产品性能,促进我国轮胎产品顺利出口。  相似文献   
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