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AGGREGATION ERROR EFFECTS ON THE DISCRETE-SPACE p-MEDIAN MODEL: THE CASE OF EDMONTON, CANADA 总被引:2,自引:0,他引:2
The spatial analysis literature recognizes three sources of aggregation error, termed Source A, Source B, and Source C, which affect models relying on distance measurements between populations and facilities. We consider these effects with respect to aggregating from census enumeration areas to census tracts, on a popular location model. We identify a further source of aggregation error, which we dub Source D error, arising from the representation of facility sites by discrete points. Source D effects are of the same magnitude as Source A and B combined, much greater than Source C effects. Source D error is further significant, because, unlike Source A and B error, it can be eliminated only by disaggregating .
La littérature sur Vanalyse spatiale reconnaît trois sources d'erreur d'agrégation appelées erreurs de source A, B, et C. Ces erreurs influencent les modèles qui reposent sur des mesures de distance entre des populations et des installations. On considère les effets d'agrégation des secteurs de dénombrement en secteurs de recensement sur un modèle de localisation courant. On identifie une quatrième source d'erreur d'agrégation appelée erreur de source D. Cette erreur découle de la représentation des sites des installations par des points discrets. Ses effets sont du même ordre de grandeur que ceux des sources A et B combinées et beaucoup plus grands que les effets de source G. L'erreur de source D est d'autant plus significative à cause du fait que, contrairement aux erreurs de source A et B, elle ne peut être éliminée que par la désagrégation . 相似文献
La littérature sur Vanalyse spatiale reconnaît trois sources d'erreur d'agrégation appelées erreurs de source A, B, et C. Ces erreurs influencent les modèles qui reposent sur des mesures de distance entre des populations et des installations. On considère les effets d'agrégation des secteurs de dénombrement en secteurs de recensement sur un modèle de localisation courant. On identifie une quatrième source d'erreur d'agrégation appelée erreur de source D. Cette erreur découle de la représentation des sites des installations par des points discrets. Ses effets sont du même ordre de grandeur que ceux des sources A et B combinées et beaucoup plus grands que les effets de source G. L'erreur de source D est d'autant plus significative à cause du fait que, contrairement aux erreurs de source A et B, elle ne peut être éliminée que par la désagrégation . 相似文献
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《增校清朝进士题名碑录·附引得》进士籍贯刊误述论 总被引:2,自引:0,他引:2
毛晓阳 《中国历史地理论丛》2007,22(1):106-115
文章以列表的方式,论述了《增校清朝进士题名碑录.附引得》中存在的6种进士籍贯刊误现象,即:省际进士籍贯刊载互误、省内进士县际籍贯互误、进士籍贯标注字误、以俗名标注进士籍贯、以府名标注进士籍贯及以府、县二级标注进士籍贯。文章并较细致地探讨了该书出现这些刊误的原因。 相似文献
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刘传鸿 《古籍整理研究学刊》2002,(6):67-72
1981年中华书局出版的方南生先生校点本《酉阳杂俎》是目前唯一一本既有校又有点的《酉阳杂俎》本子,也可以说是目前最好的《酉阳杂俎》本子。但是此本在点校方面也存在着一些诸如失校、误校、标点错误等方面的问题,本在参照脉望馆本、《学津》本、《津逮》本、《稗海》本的基础上,力求对方先生本子的校点作部分订补。 相似文献
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Ennio Pannese 《Journal of the history of the neurosciences》2013,22(2):132-140
The black reaction, invented in 1873 by Camillo Golgi (1843-1926), was the first technique to reveal neurons in their entirety, i.e. with all their processes. This important development passed unnoticed at first and only received wide international attention after a long delay. The Golgi stain was widely employed for almost thirty years and was directly responsible for major advances in our knowledge of the microscopic anatomy of the nervous system, as well as in other fields of study. In the hands of other researchers, the black reaction provided vital evidence that helped to establish the neuron theory. The Golgi stain was almost forgotten in the period between the two World Wars, but the introduction of the electron microscope to neurocytological research revived its use around the middle of the twentieth century. Today, the black reaction is still used extensively not only in combination with electron microscopy, but also as an autonomous technique in studies on the evolution, ontogeny, and organization of the nervous system. 相似文献
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基于北京市六环内住房租赁样本的交易数据,本文以北京地铁为例,采用空间回归模型实证探讨轨道交通对合租和整租这两种不同方式下的住房租赁价格的影响。结果表明:①基于轨道交通的就业可达性对于租赁价格会产生显著的增值效应,租客愿意为就业可达性较好的住房支付溢价租金。②地铁站点密度对整租的租赁价格具有正向影响,对合租无显著影响,而地铁换乘线路变量未对租赁价格产生显著影响。③轨道交通对合租和整租住房租赁价格的影响随着距离增加呈现差异化的演变规律。合租方式的租赁价格的影响随着实际路网距离的增加呈现单调递减,距站点500m范围内影响最大;而整租方式呈现倒“U”形变化,在500-1500m范围内增值效应最大。针对研究结果,建议政府加大租赁住房供给的同时要充分考虑轨道交通要素,精准施策以实现公共资源的空间高效配置。 相似文献
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以淳熙《新安志》、弘治《徽州府志》、道光《徽州府志》为主要参考,广征其他文献资料,对《永乐大典》所收《新安志》的七条记载中的错误作了订正。 相似文献
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Marie Elaine Danforth Kristrina Shuler Herndon Kathryn B. Propst 《International Journal of Osteoarchaeology》1993,3(4):297-302
In order to investigate replicability in scoring linear enamel hypoplasias 59 anterior teeth were evaluated by three observers. Hypoplasias were identified with low-power microscopy and by the unaided eye. Location on the tooth was determined through caliper and micrometer measurement as well as assignment to tooth ‘thirds’. Hypoplasia size was determined through measurement of episode width and comparison with a cast designed to categorize types of hypoplasia severity. Intra-observer analysis showed consistent scoring of about 65 per cent of individual hypoplasias between rounds, with high replicability in episode location, size and severity using all methods tested. Inter-observer error was similarly low for episode size and location, but consistent scoring of individual hypoplasias between observer pairs ranged between 21 and 39 per cent. It is likely that the most important factor in the low level of replicability is the slight size of the majority of hypoplasias involved. Thus, the results suggest that further work should be directed toward developing the minimum threshold for scoring episodes. Other issues include measures to control ‘drift’ in scoring procedures over time, and procedures to score large cervical hypoplasias in canines, which can appear as multiple episodes with magnification. Among the various scoring methods tested, determination of episode location was highly replicable using all three techniques. Episode width was also highly replicable using the micrometer, but the cast association proved less successful. 相似文献
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鲁迅的作品在日本译本众多,藤井省三是当代鲁迅研究者的一位代表,他于2009年出版了自己的新日译本,挑战代表专家竹内好的翻译手法,突出“异化”,摒弃“归化”。藤井的新译本有着明显的和传统译本的不同,从中也可以看出日本鲁迅研究的新动向。 相似文献