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On Population-Weighted Density 关于人口加权密度
J. Ottensmann
Population-weighted density is the mean of the densities of subareas of a larger area weighted by the populations of those subareas. It is an alternative to the conventional density measure, total population divided by total area. This paper shows that population-weighted density is equal to conventional density plus the variance in density across the subareas divided by the conventional density. This density alternative is very dependent on the size and configuration of the subareas, an issue that has not been adequately addressed by most users. Urban sprawl is associated with lower densities, and the choice of the appropriate density measure is dependent upon the negative consequences of sprawl being considered. Comparison of conventional and population-weighted densities show the latter to be more highly skewed and to sometimes rank urban area densities very differently. Population-weighted density is more strongly related to the size of the urban area, especially size in earlier years, demonstrating the effect of the timing of urban growth on density.
人口加权密度是一个更大区域的子区域密度的平均值,这些子区域的人口加权。这是一种替代传统密度测量的方法,即总人口除以总面积。研究表明,人口加权密度等于常规密度加上各分区间的密度方差除以常规密度。这种密度选择非常依赖于子区域的大小和配置,这是大多数用户没有充分解决的问题。城市蔓延与低密度有关,选择适当的密度测量取决于所考虑的城市蔓延的负面后果。传统密度和人口加权密度的比较表明,后者的倾斜程度更大,有时对城市地区密度的排名也大不相同。人口加权密度与城市面积的关系更为密切,特别是在早期,这表明城市增长的时间对密度的影响。
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引用次数: 14
Heterodox Theories of Economic Growth and Income Distribution: A Partial Survey 经济增长与收入分配的非正统理论:部分综述
A. Dutt
Heterodox theories of economic growth and income distribution are surveyed, focusing on major theories and recent contributions. First, a general framework for examining growth and distribution is discussed, in terms of which classical†Marxian and post†Keynesian–Kaleckian and other theories are presented. Since this framework examines how variables are determined in equilibrium, second, dynamics behind equilibria are examined, focusing on goods market and labor market changes. Third, the framework is extended in a variety of ways to examine additional models addressing productivity growth and technical change, money and inflation, finance and debt, additional distributional considerations, multisector issues, open economy questions, and the environment. It is concluded that the literature on heterodox theories of growth and distribution is vibrant, large, and growing, and addresses many issues that are ignored or neglected in orthodox theories, including power, unemployment, and aggregate demand.
对经济增长和收入分配的非正统理论进行了调查,重点是主要理论和最近的贡献。首先,讨论了研究增长和分配的一般框架,并根据该框架介绍了经典的马克思主义和后凯恩斯主义-卡列基主义以及其他理论。由于这个框架考察了变量是如何在均衡中确定的,其次,考察了均衡背后的动态,重点是商品市场和劳动力市场的变化。第三,该框架以多种方式进行扩展,以考察其他模型,这些模型涉及生产率增长和技术变革、货币和通货膨胀、金融和债务、额外的分配考虑、多部门问题、开放经济问题和环境。结论是,关于增长和分配的非正统理论的文献是充满活力的、大量的、不断增长的,并解决了许多在正统理论中被忽视或忽视的问题,包括权力、失业和总需求。
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引用次数: 18
Supply Chain Integration: A Review and Bibliometric Analysis 供应链整合:回顾与文献计量分析
Pub Date : 2017-07-21 DOI: 10.4172/2162-6359.1000447
A. Asgari, Abubakar Hamid, Nader Ale Ebrahim
Supply chain integration has been widely identified as a key research topic by both practitioners and academicians. In such environment, it is essential to vividly illustrate the publications contribution during the period of time and recognize research area and interests as well as the direction of research trend for future studies. With the availability of bibliometric data and variety of analytical tools for evaluation purposes, disregarding bibliometric analysis would be a missed opportunity for this area. Therefore, the current research attempts to deliver a comprehensive comparison thorough using rigorous bibliometric tools that provides a better understanding not previously fully grasped or evaluated by prior studies in the area of supply chain integration. The objective of this research is to recognize the global scientific production; the most productive authors, journals, articles and countries as well as to extract the most influential articles. The analysis begins by identifying over 500 published studies during the period of 1980 to 24th February 2016, which are then purified to works of proven influence and those authored by influential investigators. Web of Science Core Collection (formerly known as ISI), category of management was utilized to identify the relevant articles. Gaps are also discussed in knowledge about literature and bibliometrics analysis. The findings provide wisdom and a vigorous roadmap for further investigation in this field.
供应链整合已被业界和学术界广泛认为是一个重要的研究课题。在这样的环境下,生动地说明这一时期的出版物贡献,认识到研究领域和兴趣,以及未来研究的研究趋势方向是非常必要的。随着文献计量学数据的可用性和用于评价目的的各种分析工具的出现,忽视文献计量学分析将会错过这个领域的机会。因此,目前的研究试图提供一个全面的比较,通过使用严格的文献计量工具,提供一个更好的理解以前没有完全掌握或评估在供应链整合领域的先前研究。本研究的目的是认识全球科学生产;最具生产力的作者、期刊、文章和国家以及提取最具影响力的文章。分析首先确定了1980年至2016年2月24日期间发表的500多项研究,然后将其净化为具有影响力的作品以及由有影响力的研究人员撰写的作品。Web of Science Core Collection(以前称为ISI),分类管理被用来识别相关文章。空白也讨论了关于文献和文献计量学分析的知识。这些发现为这一领域的进一步研究提供了智慧和有力的路线图。
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引用次数: 12
Incentives for Replication in Economics 经济学中的复制动机
S. Galiani, P. Gertler, Mauricio Romero
Replication is a critical component of scientific credibility as it increases our confidence in the reliability of the knowledge generated by original research. Yet, replication is the exception rather than the rule in economics. In this paper, we examine why replication is so rare and propose changes to the incentives to replicate. Our study focuses on software code replication, which seeks to replicate the results in the original paper using the same data as the original study and verifying that the analysis code is correct. We analyse the effectiveness of the current model for code replication in the context of three desirable characteristics: unbiasedness, fairness and efficiency. We find substantial evidence of “overturn bias” that likely leads to many false positives in terms of “finding” or claiming mistakes in the original analysis. Overturn bias comes from the fact that replications that overturn original results are much easier to publish than those that confirm original results. In a survey of editors, almost all responded they would in principle publish a replication study that overturned the results of the original study, but only 29% responded that they would consider publishing a replication study that confirmed the original study results. We also find that most replication effort is devoted to so called important papers and that the cost of replication is high in that posited data and software are very hard to use. We outline a new model for the journals to take over replication post acceptance and prepublication that would solve the incentive problems raised in this paper.
复制是科学可信度的关键组成部分,因为它增加了我们对原始研究产生的知识可靠性的信心。然而,在经济学中,复制是例外,而不是规律。在本文中,我们研究了复制如此罕见的原因,并提出了改变复制激励的建议。我们的研究侧重于软件代码复制,它试图使用与原始研究相同的数据来复制原始论文中的结果,并验证分析代码是正确的。我们在三个理想特征的背景下分析了当前代码复制模型的有效性:无偏、公平和效率。我们发现了“推翻偏见”的大量证据,这可能导致在“发现”或声称原始分析中的错误方面出现许多误报。推翻偏倚来自于这样一个事实,即推翻原始结果的重复实验比证实原始结果的重复实验更容易发表。在一项对编辑的调查中,几乎所有编辑都表示,原则上他们会发表一项推翻原始研究结果的复制研究,但只有29%的编辑表示,他们会考虑发表一项证实原始研究结果的复制研究。我们还发现,大多数复制工作都用于所谓的重要论文,复制的成本很高,因为假设的数据和软件很难使用。为解决本文提出的激励问题,我们提出了一种新的期刊接管复制、后接受和预发表的模式。
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引用次数: 26
On the Choice of Combined Statistical Areas 论组合统计区域的选择
J. Ottensmann
Some Metropolitan Statistical Areas (MSAs) fail to encompass the full extent of metropolitan areas. Combined Statistical Areas (CSAs), combinations of Core-Based Statistical Areas, are larger and may be more a more appropriate choice for certain analyses. Differences between MSAs and CSAs (and some MSAs are not even included in CSAs) range from minor to the combination of large MSAs, with population increases ranging from a few percent more than doubling. The sharing of transportation infrastructure in the form of commuter rail service and shared airports demonstrates the integration of areas combined into CSAs. In addition, the extent of the MSAs defined for the 2000 census are comparable to current CSAs, which arise from a subsequent change in how metropolitan areas are defined.
一些都市统计区(msa)未能涵盖都市地区的全部范围。组合统计区域(csa),即基于核心的统计区域的组合,更大,对于某些分析可能是更合适的选择。msa和csa之间的差异(有些msa甚至不包括在csa中)从较小的msa到大型msa的组合,人口增长从几个百分点到一倍以上不等。以通勤铁路服务和共享机场的形式共享交通基础设施,展示了将区域整合到csa中。此外,为2000年人口普查所界定的都市生活保障指标范围与目前的都市生活保障指标相当,而目前的都市生活保障指标是由于后来界定都市地区的方式发生变化而产生的。
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引用次数: 15
The Idea of ‘Emergent Properties’ in Data Privacy: Towards a Holistic Approach 数据隐私中的“涌现属性”概念:迈向整体方法
S. Esayas
‘The whole is more than the sum of its parts.’ This article applies lessons from the concept of ‘emergent properties’ in systems thinking to data privacy law. This concept, rooted in the Aristotelian dictum ‘the whole is more than the sum of its parts’, where the ‘whole’ represents the ‘emergent property’, allows systems engineers to look beyond the properties of individual components of a system and understand the system as a single complex. Applying this concept, the article argues that the current EU data privacy rules focus on individual processing activity based on a specific and legitimate purpose, with little or no attention to the totality of the processing activities – i.e. the whole – based on separate purposes. This implies that when an entity processes personal data for multiple purposes, each processing must comply with the data privacy principles separately, in light of the specific purpose and the relevant legal basis. This (atomized) approach is premised on two underlying assumptions: (i) distinguishing among different processing activities and relating every piece of personal data to a particular processing is possible, and (ii) if each processing is compliant, the data privacy rights of individuals are not endangered. However, these assumptions are untenable in an era where companies process personal data for a panoply of purposes, where almost all processing generates personal data and where data are combined across several processing activities. These practices blur the lines between different processing activities and complicate attributing every piece of data to a particular processing. Moreover, when entities engage in these practices, there are privacy interests independent of and/or in combination with the individual processing activities. Informed by the discussion about emergent property, the article calls for a holistic approach with enhanced responsibility for certain actors based on the totality of the processing activities and data aggregation practices.
“整体大于各部分的总和。本文将系统思维中的“涌现属性”概念应用到数据隐私法中。这个概念根植于亚里士多德的格言“整体大于部分的总和”,其中“整体”代表“涌现属性”,允许系统工程师超越系统单个组件的属性,并将系统理解为一个单一的综合体。运用这一概念,文章认为,当前的欧盟数据隐私规则侧重于基于特定和合法目的的个人处理活动,很少或根本没有关注基于单独目的的处理活动的总体-即整体。这意味着,当一个实体出于多种目的处理个人数据时,每次处理都必须根据具体目的和相关法律依据,分别遵守数据隐私原则。这种(原子化的)方法以两个基本假设为前提:(i)区分不同的处理活动并将每个个人数据与特定处理联系起来是可能的;(ii)如果每个处理都是合规的,则个人的数据隐私权不会受到威胁。然而,这些假设在一个公司处理个人数据的时代是站不住脚的,在这个时代,几乎所有的处理都会产生个人数据,并且数据是跨几个处理活动组合在一起的。这些实践模糊了不同处理活动之间的界限,并使将每个数据块归因于特定处理变得复杂。此外,当实体从事这些实践时,存在独立于个人处理活动和/或与个人处理活动相结合的隐私利益。通过对紧急属性的讨论,本文呼吁采用一种整体方法,在处理活动和数据聚合实践的总体基础上增强对某些参与者的责任。
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引用次数: 4
Transparency, Reproducibility, and the Credibility of Economics Research 经济学研究的透明度、可重复性和可信度
Garret Chistensen, E. Miguel
There is growing interest in enhancing research transparency and reproducibility in economics and other scientific fields. We survey existing work on these topics within economics and discuss the evidence suggesting that publication bias, inability to replicate, and specification searching remain widespread in the discipline. We next discuss recent progress in this area, including through improved research design, study registration and pre-analysis plans, disclosure standards, and open sharing of data and materials, drawing on experiences in both economics and other social sciences. We discuss areas where consensus is emerging on new practices, as well as approaches that remain controversial, and speculate about the most effective ways to make economics research more credible in the future. ( JEL A11, C18, I23)
人们对提高经济学和其他科学领域的研究透明度和可重复性越来越感兴趣。我们调查了经济学中关于这些主题的现有工作,并讨论了表明发表偏倚、无法复制和规范搜索在该学科中仍然普遍存在的证据。接下来,我们将讨论这一领域的最新进展,包括通过改进研究设计、研究注册和预分析计划、披露标准以及开放共享数据和材料,借鉴经济学和其他社会科学的经验。我们讨论了在新实践方面正在形成共识的领域,以及仍然存在争议的方法,并推测了使经济学研究在未来更加可信的最有效方法。(jel 11, c18, i23)
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引用次数: 295
Case Study: How Misinterpreting Probabilities Can Cost You the Game 案例分析:错误解读概率如何导致游戏失败
K. Rotthoff
Using data to make future decisions can increase the odds of success in many aspects of life, however, using the data incorrectly can be worse than not using any data at all. In this study, I present a case where a collegiate football coach attempted to use data to enhance the chances of success. In fact, because of his misinterpretation the dependence (or independence) of odds across his play-calling, his play-calling was not only sub-optimal but was detrimental to his team. This case study is designed as a way to clarify this common mistake our students make when interpreting data.
使用数据来做未来的决定可以增加生活中许多方面的成功几率,然而,错误地使用数据可能比根本不使用任何数据更糟糕。在本研究中,我提出了一个案例,其中一个大学足球教练试图使用数据来提高成功的机会。事实上,由于他误解了他的战术召唤中几率的依赖性(或独立性),他的战术召唤不仅是次优的,而且对他的团队有害。本案例研究旨在澄清学生在解释数据时常犯的错误。
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引用次数: 0
Linear Probability Models (LPM) and Big Data: The Good, the Bad, and the Ugly 线性概率模型(LPM)和大数据:好、坏、丑
S. Chatla, Galit Shmueli
Linear regression is among the most popular statistical models in social sciences research. Linear probability models (LPMs) - linear regression models applied to a binary outcome - are used in various disciplines. Surprisingly, LPMs are rare in the IS literature, where logit and probit models are typically used for binary outcomes. LPMs have been examined with respect to specific aspects, but a thorough evaluation of their practical pros and cons for different research goals under different scenarios is missing. We perform an extensive simulation study to evaluate the advantages and dangers of LPMs, especially in the realm of Big Data that now affects IS research. We evaluate LPM for the three common uses of binary outcome models: inference and estimation, prediction and classification, and selection bias. We compare its performance to logit and probit, under different sample sizes, error distributions, and more. We find that coefficient directions, statistical significance, and marginal effects yield results similar to logit and probit. Although LPM coefficients are biased, they are consistent for the true parameters up to a multiplicative scalar. Coefficient bias can be corrected by assuming an error distribution. For classification and selection bias, LPM is on par with logit and probit in terms of class separation and ranking, and is a viable alternative in selection models. It is lacking when the predicted probabilities are directly of interest, because predicted probabilities can exceed the unit interval. We illustrate some of these results through by modeling price in online auctions, using data from eBay.
线性回归是社会科学研究中最常用的统计模型之一。线性概率模型(lpm) -应用于二元结果的线性回归模型-用于各种学科。令人惊讶的是,lpm在IS文献中很少见,其中logit和probit模型通常用于二进制结果。lpm已经从特定的方面进行了研究,但是对于不同场景下不同研究目标的实际优缺点的全面评估仍然缺失。我们进行了广泛的模拟研究,以评估lpm的优势和危险,特别是在现在影响IS研究的大数据领域。我们评估了二元结果模型的三种常见用途:推理和估计,预测和分类,以及选择偏差。在不同的样本量、误差分布等情况下,我们将其性能与logit和probit进行比较。我们发现系数方向、统计显著性和边际效应产生的结果与logit和probit相似。尽管LPM系数是有偏差的,但它们对于真正的参数是一致的,直到一个乘法标量。系数偏差可以通过假设误差分布来修正。对于分类和选择偏差,LPM在类分离和排序方面与logit和probit相当,是一种可行的选择模型。当预测概率是直接感兴趣的,因为预测概率可能超过单位区间时,它是缺乏的。我们通过使用eBay的数据对在线拍卖中的价格进行建模来说明其中的一些结果。
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引用次数: 18
What Statistics Canada Survey Data Sources Are Available to Study Neurodevelopmental Conditions and Disabilities in Children and Youth? 加拿大统计局有哪些调查数据来源可用于研究儿童和青少年的神经发育状况和残疾?
Pub Date : 2016-09-22 DOI: 10.11575/SPPP.V9I0.42601
Rubab G. Arim, L. Findlay, D. Kohen
Researchers with an interest in examining and better understanding the social context of children suffering from neurodevelopmental disabilities can benefit by using data from a wide variety of Statistics Canada surveys as well as the information contained in administrative health databases. Selective use of a particular survey and database can be informative particularly when demographics, samples, and content align with the goals and outcomes of the researcher’s questions of interest. Disabilities are not merely conditions in isolation. They are a key part of a social context involving impairment, function, and social facilitators or barriers, such as work, school and extracurricular activities. Socioeconomic factors, single parenthood, income, and education also play a role in how families cope with children’s disabilities. Statistics indicate that five per cent of Canadian children aged five to 14 years have a disability, and 74 per cent of these are identified as having a neurodevelopmental condition and disability. A number of factors must be taken into account when choosing a source of survey data, including definitions of neurodevelopmental conditions, the target group covered by the survey, which special populations are included or excluded, along with a comparison group, and the survey’s design. Surveys fall into categories such as general health, disability-specific, and children and youth. They provide an excellent opportunity to look at the socioeconomic factors associated with the health of individuals, as well as how these conditions and disabilities affect families. However rich the information gleaned from survey data, it is not enough, especially given the data gaps that exist around the health and well-being of children and older youths. This is where administrative and other data can be used to complement existing data sources. Administrative data offer specific information about neurological conditions that won’t be collected in general population surveys, given the nature of such surveys. While researchers can glean information from survey data such as functional health and disability, social inclusion or exclusion, and the role of social determinants in the lives of these children and their families, administrative data can identify rare neurodevelopmental conditions and disabilities not captured in general surveys. Analyzing information from all these sources can lead to a more nuanced understanding of the economic and social impacts, and functional limitations in daily living, that patients and their families experience with certain neurodevelopmental conditions and disabilities. Statistics Canada surveys offer a plethora of information for researchers interested in neurodevelopmental disabilities and social determinants of health. As these surveys are national in their scope, they provide a wealth of information for statistical analysis from people across Canada. This information can be used to inform researchers, policy
对研究和更好地了解患有神经发育障碍的儿童的社会环境感兴趣的研究人员可以利用加拿大统计局各种调查的数据以及行政卫生数据库所载的信息。有选择地使用特定的调查和数据库可以提供信息,特别是当人口统计数据、样本和内容与研究人员感兴趣的问题的目标和结果一致时。残疾不仅仅是孤立的状况。他们是社会环境的关键组成部分,涉及残疾、功能和社会促进因素或障碍,如工作、学校和课外活动。社会经济因素、单亲家庭、收入和教育也在家庭如何应对儿童残疾方面发挥作用。统计数字表明,5至14岁的加拿大儿童中有5%患有残疾,其中74%被确定为患有神经发育疾病和残疾。在选择调查数据的来源时,必须考虑到许多因素,包括神经发育状况的定义,调查所涵盖的目标群体,包括或排除哪些特殊人群,以及比较组,以及调查的设计。调查分为一般健康、特定残疾以及儿童和青年等类别。它们为研究与个人健康有关的社会经济因素以及这些条件和残疾如何影响家庭提供了极好的机会。无论从调查数据中收集到多么丰富的信息,都是不够的,特别是考虑到围绕儿童和大龄青年的健康和福祉存在的数据缺口。在这里,可以使用管理数据和其他数据来补充现有数据源。行政数据提供了关于神经系统疾病的具体信息,鉴于此类调查的性质,这些信息不会在一般人口调查中收集到。虽然研究人员可以从调查数据中收集信息,如功能性健康和残疾,社会包容或排斥,以及社会决定因素在这些儿童及其家庭生活中的作用,但行政数据可以确定一般调查中未捕获的罕见神经发育状况和残疾。分析来自所有这些来源的信息可以更细致地了解经济和社会影响,以及日常生活中的功能限制,这些都是患有某些神经发育疾病和残疾的患者及其家属所经历的。加拿大统计局的调查为研究神经发育障碍和健康的社会决定因素的研究人员提供了大量信息。由于这些调查的范围是全国性的,它们为加拿大各地的人们提供了丰富的统计分析信息。这些信息可用于向研究人员、政策制定者和患有神经发育疾病和残疾的人的家庭提供信息。例如,已采用复杂的微观模拟建模技术来预测这种残疾对未来20年的健康和经济影响。这些预测对于负责设计帮助这些人的服务和项目的决策者至关重要。然而,还有很多工作要做。加拿大统计局已经开始研究利用行政数据将儿童残疾概念化的可能性,并利用在国家行政数据库中匿名化的数据研究加拿大儿童的健康状况。这些都是建立未来研究的良好基础。
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引用次数: 5
期刊
ERN: Other Econometrics: Data Collection & Data Estimation Methodology (Topic)
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