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Comparing rankings of search results on the Web 总被引：1，自引：0，他引：1
The Web has become an information source for professional data gathering. Because of the vast amounts of information on almost all topics, one cannot systematically go over the whole set of results, and therefore must rely on the ordering of the results by the search engine. It is well known that search engines on the Web have low overlap in terms of coverage. In this study we measure how similar are the rankings of search engines on the overlapping results.We compare rankings of results for identical queries retrieved from several search engines. The method is based only on the set of URLs that appear in the answer sets of the engines being compared. For comparing the similarity of rankings of two search engines, the Spearman correlation coefficient is computed. When comparing more than two sets Kendall’s W is used. These are well-known measures and the statistical significance of the results can be computed. The methods are demonstrated on a set of 15 queries that were submitted to four large Web search engines. The findings indicate that the large public search engines on the Web employ considerably different ranking algorithms. 相似文献
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In recent years there has been an intense debate in many countries concerning the best approach to improving schools. The various methods being tried might be reasonably seen as constituting a continuum ranging from strict external control and inspection at one end, to self-evaluation and internal regulation at the other. In practice, most education systems appear to be moving towards a combination of these methods, involving a degree of external monitors of internal self-evaluation mechanisms. This article analyses the gradual emergence in the Irish education system of such an accommodation. It charts the increased emphasis being placed upon school self-evaluation and argues that it does constitute the best way forward. However, it also highlights a major lacuna at the heart of the emerging system, namely the lack of firm data on which schools can really base effective improvement strategies. 相似文献
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谢飞军 《浙江教育学院学报》2002,(3):74-78
纵观国际师范教育发展趋势，师范教育体系将最终逐步从一元封闭型向多元开放型转变。通过对师范教育面临的挑战，以及社会经济，教育的发展形势分析，提出高水平，有活力的教师教育体系的构建思路。 相似文献
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张秋艳 《浙江教育学院学报》2002,(3):1-7
东汉到魏晋南北朝，古代汉语发生了质的变化，出现了许多新的词语 新的句法格式。《颜氏家训》正是这一时期的作，使南北朝时期的复音词发展得以展现。 相似文献