Searching the World Wide Web
Searching the World Wide Web
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DOI：
10.1126/science.280.5360.98
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发表时间：
1998-04-03
期刊：
影响因子：
56.9
通讯作者：
Giles, CL
中科院分区：
文献类型：
--
作者：
Lawrence, S;Giles, CL
对主要万维网搜索引擎的覆盖率和新近度进行了分析，得出了一些令人惊讶的结果。任何一个引擎的覆盖范围都是非常有限的：没有一个单一的引擎索引超过三分之一的“可索引的Web”，六个引擎的覆盖范围在一个数量级上变化，将六个引擎的结果结合起来，平均产生的文档数量是仅使用一个引擎的结果的3.5倍。对引擎对之间重叠的分析给出了可索引Web的3.2亿页大小的估计下限。
The coverage and recency of the major World Wide Web search engines was analyzed, yielding some surprising results. The coverage of any one engine is significantly limited: No single engine indexes more than about one-third of the "indexable Web," the coverage of the six engines investigated varies by an order of magnitude, and combining the results of the six engines yields about 3.5 times as many documents on average as compared with the results from only one engine. Analysis of the overlap between pairs of engines gives an estimated lower bound on the size of the indexable Web of 320 million pages.