共查询到20条相似文献,搜索用时 15 毫秒
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This paper shows four statistical methods that examine the distribution of points on a network (such as the distribution of retail stores along streets). The first statistical method is an extension of the nearest-neighbor distance method (the Clark-Evans statistic) defined on a plane to the method defined on a network. The second statistical method examines the effect of categorical attribute values of links (say, types of streets) on the distribution of activity points on a network. The third statistical method examines the effect of infrastructural elements (such as railway stations) on the distribution of activity points on a network. The fourth statistical method examines the compound effect of multiple kinds of infrastructural elements (say, railway stations and big parks) on the distribution of activity points on a network. These methods are discussed with empirical examples. 相似文献
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《Post-Medieval Archaeology》2013,47(1):90-101
AbstractThis article describes the two major systems for dating clay pipe stem fragments by statistical methods, examines the results and suggests ways of minimizing their limitations. 相似文献
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To analyze social network data using standard statistical approaches is to risk incorrect inference. The dependencies among observations implied in a network conceptualization undermine standard assumptions of the usual general linear models. One of the most quickly expanding areas of social and policy network methodology is the development of statistical modeling approaches that can accommodate such dependent data. In this article, we review three network statistical methods commonly used in the current literature: quadratic assignment procedures, exponential random graph models (ERGMs), and stochastic actor‐oriented models. We focus most attention on ERGMs by providing an illustrative example of a model for a strategic information network within a local government. We draw inferences about the structural role played by individuals recognized as key innovators and conclude that such an approach has much to offer in analyzing the policy process. 相似文献
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使用统计数据方面存在的问题,已经成为影响第二轮志书质量的因素之一。因此,使用统计数据必须遵循严谨科学、全面系统的原则,应当经过认真严密的校核、考证,做到重要的基本的统计数据说明资料来源,并在必要时注明统计口径、范围,力求反映地情概貌的基本数据全面系统,注意防止志书数据保密上的两种错误倾向,使志书真正达到存真求实、确保质量的要求。 相似文献
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Naila Kabeer 《Development and change》1992,23(2):115-139
This article evaluates the usefulness of cost-benefit analysis (CBA) in the field of gender and development planning. While the incorporation of distributional considerations into CBA would appear to have made it more sensitive to gender differentials, the article argues that it is limited by a number of factors. These include both its own methodological biases, such as the bias towards marketed activities and quantifiable indicators, as well as the political economy of gender at different stages of the project cycle. Empirical examples from both First and Third World contexts are drawn on to demonstrate how these biases work in practice. The article concludes that CBA is best suited to interventionist, rather than participatory projects; to efficiency, rather than equity goals; and, where equity is the goal, to women's practical needs rather than their strategic gender interests. 相似文献
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The development of North Sea oil and gas resources is related to technological problems, cost and government involvement. Most activity has centred on Norway and Scotland; nevertheless, countries such as France and West Germany, with a lack of indigenous offshore resources, have broken into the offshore supplies market in other sectors. 相似文献
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V. V. Pokshishevskiy 《Eurasian Geography and Economics》2013,54(8):35-50
The author develops a methodology for measuring the extra cost involved in settling people under unfavorable geographical conditions. He distinguishes the engineering-cost differential of buildings, roads, utilities, etc., and the “residual effect” of unfavorable geographical conditions which continues to inconvenience the population even after partial compensation by engineering means. While the engineering-cost differential can be relatively easily measured in ruble terms, the residual effect is less easily converted into actual costs. The author looks toward compilation of a map of the cost differentials of human settlement. 相似文献
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Toward Self-Sufficiency: Evaluating a Transitional Housing Program for Homeless Families 总被引:1,自引:0,他引:1
Robert L. Fischer 《政策研究杂志》2000,28(2):402-420
Homeless families face the economic and personal challenges of sparse employment opportunities and child care and nutrition needs, compounded by the loss of adequate housing. The Family Development Center (FDC) is a transitional housing program in Atlanta, Georgia, designed to provide young homeless mothers an opportunity to emerge from what may well be desperate circumstances and begin the journey to economic self-sufficiency. This paper describes the research on programs for homeless families and presents the results of a comprehensive look at the operation and effectiveness of the FDC program during its first 5 years of existence. The work shows that while many families were able to effect notable positive changes in their lives during and after taking part in the housing program, for some the recovery from homelessness was extremely difficult. For even the most successful formerly homeless families—those that secured employment, housing, and other social supports—the escape from welfare dependence and poverty proved very difficult. The paper concludes with a discussion of the implications for relevant public policy. 相似文献
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古罗马等级制度中的显贵 总被引:1,自引:0,他引:1
早在19世纪,德国古典学大师蒙森就发现,在古罗马社会的政治生活中存在着一个特权等级——显贵(mbilis,或nobilitas),他们控制着执政官、元老院等权力机构,大权在握,地位显赫。20世纪初,另一位德国学格尔泽的研究表明,绝大多数罗马显贵都出身于执政官家族, 相似文献
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V. B. Nefedova 《Eurasian Geography and Economics》2013,54(4):244-250
A landscape map of northern Tyumen' Oblast, an area of intensive oil and gas development, is used as the base for compilation of an applied landscape map evaluating the environment in terms of suitability for various means of transportation. In terms of such criteria as the carrying capacity of the ground, dissection of terrain and slope angles, climate, distances between trees, bog and lake cover, 16 regions offering distinctive conditions for transport development are delimited and mapped. The technique is offered as an aid in estimating transport-development costs and may be applied for similar purposes in other regions of USSR. 相似文献
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本文分析了现存的北魏墓志材料,考虑到北魏时期存在三种不同尺度的状况,对北魏墓志的大小类别采取了较宽松的标准,从而揭示出北魏墓志中存在的等级制度,并对个别不符合这一制度的墓志材料作了合理的解释。说明在北魏时期,随着正方形墓志成为主要的墓志形制,结合礼制,已经形成了一套对墓志外形尺寸以及雕饰的正式等级规定。隋代以后的墓志制度基本上沿袭了这一规定,或在其基础上加以调整。 相似文献
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Tom Brughmans 《Journal of Archaeological Method and Theory》2013,20(4):623-662
This review aims to expose the potential of formal network methods for archaeology by tracing the origins of the academic traditions, network models, and techniques that have been most influential to archaeologists. A brief discussion of graph theoretic applications in archaeology reveals how graph visualization and analysis was used since the 1960s in a very similar way to later network analysis applications, but did not seem to have influenced the more widespread adoption of network techniques over the past decade. These recent archaeological applications have been strongly influenced by two academic traditions, social network analysis and sociophysics. The most influential and promising techniques and models adopted from these traditions are critically discussed. This review reveals some general trends which are considered to be the result of two critical issues that will need to be addressed in future archaeological network analysis: (1) a general unawareness of the historicity and diversity of formal network methods both within and outside the archaeological discipline has resulted in a very limited methodological scope; (2) the adoption or development of network methods has very rarely been driven by specific archaeological research questions and is dominated by a few popular models and techniques, which has in some cases resulted in a routinized explanatory process. This review illustrates, however, the great potential of formal network methods for archaeology and argues that, if this potential is to be applied in a critical way, a broad multidisciplinary scope is necessary and specific archaeological research contexts should dominate applications. 相似文献
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Using a Web-based Resource to Prepare Students for Fieldwork: Evaluating the Dark Peak Virtual Tour 总被引:1,自引:0,他引:1
《Journal of Geography in Higher Education》2012,36(2):223-240
This paper reports on development of a Dark Peak website and its use to prepare first-year geography students for a one-day physical geography field course in the south Pennines. The Virtual Tour (VT) component of the website is the main focus of this paper. Pre- and post-fieldwork evaluations of the first version of the VT by 195 students are presented with the revisions undertaken as a result of this feedback. Recommendations for the design and implementation of virtual fieldwork websites are made. The current version is available at http://www.art.man.ac.uk/Geog/fieldwork/ 相似文献
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James O. Huff 《Geographical analysis》1976,8(3):231-254
A simple hierarchical migration model is proposed as a mechanism for the redistribution of population within a Christaller central place hierarchy. Given a predefined functional hierarchy, the migration process causes any initial population distribution to converge to an equilibrium distribution. Under certain special conditions, the equilibrium is identical to a central place population distribution derived from economic base concepts. 相似文献
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This paper presents an interperiod network storage location-allocation (INSLA) model to solve the just-in-time production planning problem. The model is extended to a multiobjective problem in which trade-offs between delivery time and transportation costs are analyzed. The results for a hypothetical problem show that in an attempt to reduce inventories on the part of the primary purchaser of raw materials, the possibility exists for less than optimal behavior in the system. 相似文献