共查询到19条相似文献,搜索用时 62 毫秒
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基于带有技术进步系数的柯布—道格拉斯生产函数对物流系统的数学模型进行改进以及实例验证,得到了当生产技术随时间变动时,能够反映技术进步对物流系统产出影响的函数模型。然后运用多元线性回归的方法对模型的参数进行检验,同时也对模型本身的显著性进行回归拟合,效果均为显著。 相似文献
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文章基于柯布-道格拉斯生产函数,对1992~2005年期间我国物流产业统计数据进行实证研究.结果表明:人力资本和物质资本是影响我国物流产业发展的二个关键要素:产业处于规模报酬递增阶段,主要靠物质资本投资推动,物质资本投入量对产业增长的贡献率为79,9%;人力资本的产出弹性较高,对产出有明显的积极影响,但由于人力资本存量增长缓慢,对产业增长的贡献较低.最后,对物流产业的进一步发展提出若干建议. 相似文献
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自从中国和越南启动经济改革以来,两国都取得了非凡的经济增长。由于各种影响因素,虽然中国与越南具有非常相似的经济发展模式,但是越南的经济增长明显落后于中国。虽然两国经济改革的启动时间相差近十年,两国却具有突出的相似特征,如导致改革的环境、初始的社会经济发展条件以及改革与经济管理方式。中国与越南的经济改革都始于一种为变革提供了接纳能力、危机和机遇三个重要因素的环境。本文基于柯布-道格拉斯生产函数的研究方法,运用两国1995—2013年的相关数据对两国的经济改革模式进行了比较研究。 相似文献
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余鹏 《数量经济技术经济研究》1992,(12):54-55
贵刊1992年第9期,发表了贾凤和、李树德《经济优势比较的判剧》一文。这篇文章引用了他们在1991年发表在贵刊第5期的文章《技术进步对产值增长贡献的度量方法》中的结论。但这个结论,无论从数学推导还是从经济含义上都是难以成立的。现将我的看法表述如下,供大家讨论、参考。 相似文献
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从河南就业总量、职工平均工资两个角度分析FDI对河南人力资本存量的影响程度,结果表明:FDI对河南人力资本存量具有正的推动效应。 相似文献
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外商直接投资技术溢出效应实证分析——以四川省工业部门为例 总被引:1,自引:0,他引:1
文章采用1999到2008年的数据,在柯布-道格拉斯函数的基础上验证了四川地区外商直接投资的技术溢出效应,实证结果发现:四川省的外商直接投资对四川省工业部门不存在正的技术溢出效应. 相似文献
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物流产业的转型升级是促进北京经济成功转型进而推动经济增长的重要措施之一。物流产业的发展对北京经济增长有着不可替代的作用。文章在总结和分析现有文献的基础上,利用北京2000~2015年的统计数据,借鉴Miiler与Upadhyay(2000)的思路,以科布—道格拉斯函数生产函数为模型,对物流与经济增长关系进行计量分析。结果表明:相对于其他投入要素对经济增长的贡献来说,物流行业中的交通运输、仓储、邮政业产值对经济增长的影响很大,且比重正在不断上升。北京经济的快速发展需要快速发展物流产业。 相似文献
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本文从柯布-道格拉斯生产函数入手,将劳动力按受教育程度划分为四类分别进行处理。主要就中国国内生产总值(GDP)与各等教育程度劳动力和投资之间关系进行单整和协整检验,并建立误差修正模型(ECM),然后在协整条件下对各等教育程度劳动力与GDP的长、短期关系进行分析。文章的实证结果将为我国有关部门的政策决策提供有力依据。 相似文献
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本文从柯布-道格拉斯生产函数入手,将劳动力按受教育程度划分为四类分别进行处理.主要就中国国内生产总值(GDP)与各等教育程度劳动力和投资之间关系进行单整和协整检验,并建立误差修正模型(ECM),然后在协整条件下对各等教育程度劳动力与GDP的长、短期关系进行分析.文章的实证结果将为我国有关部门的政策决策提供有力依据. 相似文献
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This study focused on the effectiveness in nonuniform polytomous item DIF detection using Discriminant Logistic Analysis (DLA)
and Multinomial Logistic Regression (MLR). A computer simulation study was conducted to compare the effect of using DLA and
MLR, applying either an iterative test purification procedure or non-iterative to detect nonuniform DIF. The conditions under
study were: DIF effect size (0.5, 1.0 and 1.5), sample size (500 and 1000), percentage of DIF items in the test (0, 10 and
20%) and DIF type (nonuniform). The results suggest that DLA is more accurate than MLR in detecting DIF. However, the purification
process only improved the correct detection rate when MLR was applied. The false positive rates for both procedures were similar.
Moreover, when the test purification procedure was used, the proportion of non-DIF items that were detected as DIF decreased
for both procedures, although the false positive rates were smaller for DLA than for MLR. 相似文献
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Logistic regression analysis may well be used to develop a predictive model for a dichotomous medical outcome, such as short-term mortality. When the data set is small compared to the number of covariables studied, shrinkage techniques may improve predictions. We compared the performance of three variants of shrinkage techniques: 1) a linear shrinkage factor, which shrinks all coefficients with the same factor; 2) penalized maximum likelihood (or ridge regression), where a penalty factor is added to the likelihood function such that coefficients are shrunk individually according to the variance of each covariable; 3) the Lasso, which shrinks some coefficients to zero by setting a constraint on the sum of the absolute values of the coefficients of standardized covariables.
Logistic regression models were constructed to predict 30-day mortality after acute myocardial infarction. Small data sets were created from a large randomized controlled trial, half of which provided independent validation data. We found that all three shrinkage techniques improved the calibration of predictions compared to the standard maximum likelihood estimates. This study illustrates that shrinkage is a valuable tool to overcome some of the problems of overfitting in medical data. 相似文献
Logistic regression models were constructed to predict 30-day mortality after acute myocardial infarction. Small data sets were created from a large randomized controlled trial, half of which provided independent validation data. We found that all three shrinkage techniques improved the calibration of predictions compared to the standard maximum likelihood estimates. This study illustrates that shrinkage is a valuable tool to overcome some of the problems of overfitting in medical data. 相似文献
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在土地和资金紧缺的约束下,如何制定有效的物流政策以合理的配置资源成为资源紧缺型城市发展经济的首要问题。文中以汕头现代物流业发展为例,在分析比较了上海、广州、深圳、厦门等城市的物流战略目标和政策体系的基础上,从物流产业政策、物流管理协调机制、基础设施和信息平台保障政策等方面提出了汕头市的现代物流政策体系。 相似文献
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Logistic Regression, a review 总被引:1,自引:0,他引:1
A review is given of the development of logistic regression as a multi-purpose statistical tool.
A historical introduction shows several lines culminating in the unifying paper of Cox (1966), in which theory as developed in the field of bio-assay is shown to be applicable to designs as discriminant-analysis and case-control study. A review is given of several designs all leading to the same analysis. The link is made with epidemiological literature.
Several optimization criteria are discussed that can be used in the case of more observations per cell, namely maximum likelihood, minimum chi-square and weighted regression on the observed logits. Recent literature on the goodness of fit problem is reviewed and finally, comments are made about the non-parametric approach to logistic regression which is still in rapid development. 相似文献
A historical introduction shows several lines culminating in the unifying paper of Cox (1966), in which theory as developed in the field of bio-assay is shown to be applicable to designs as discriminant-analysis and case-control study. A review is given of several designs all leading to the same analysis. The link is made with epidemiological literature.
Several optimization criteria are discussed that can be used in the case of more observations per cell, namely maximum likelihood, minimum chi-square and weighted regression on the observed logits. Recent literature on the goodness of fit problem is reviewed and finally, comments are made about the non-parametric approach to logistic regression which is still in rapid development. 相似文献
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收集整理目前热播的电视相亲节目《非诚勿扰》的200位剩男的相关数据,采用logistic回归方法对其建模,分析剩男剩女牵手成功,与年龄,出场顺序,仪表长相,工作,经济基础,车,房,婚史等因素的关系。结果表明仪表长相对单身青年牵手成功的影响最大,其次是有车、有房。 相似文献
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基于服务质量的物流绩效模糊综合评价方法及应用 总被引:8,自引:0,他引:8
在回顾物流绩效评价相关研究成果的基础上,提出基于服务质量进行物流绩效评价的观点;并通过构建相关的物流绩效评价指标体系,结合模糊理论给出了物流绩效的模糊评价方法。最后,通过具体案例说明其在实际中的应用。 相似文献