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Search engine coverage bias: evidence and possible causes

机译：搜索引擎覆盖率偏差：证据和可能的原因

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摘要

Commercial search engines are now playing an increasingly important role in Web information dissemination and access. Of particular interest to business and national governments is whether the big engines have coverage biased towards the US or other countries. In our study we tested for national biases in three major search engines and found significant differences in their coverage of commercial Web sites. The US sites were much better covered than the others in the study: sites from China, Taiwan and Singapore. We then examined the possible technical causes of the differences and found that the language of a site does not affect its coverage by search engines. However, the visibility of a site, measured by the number of links to it, affects its chance to be covered by search engines. We conclude that the coverage bias does exist but this is due not to deliberate choices of the search engines but occurs as a natural result of cumulative advantage effects of US sites on the Web. Nevertheless, the bias remains a cause for international concern.
机译：商业搜索引擎现在在Web信息的传播和访问中扮演着越来越重要的角色。商业和中央政府特别感兴趣的是大型引擎的覆盖范围是否偏向美国或其他国家。在我们的研究中，我们测试了三个主要搜索引擎中的国家偏见，并发现它们对商业网站的覆盖率存在显着差异。在研究中，美国站点的覆盖范围比其他站点好得多：来自中国，台湾和新加坡的站点。然后，我们检查了差异的可能技术原因，并发现网站的语言不会影响搜索引擎对其的覆盖范围。但是，通过链接的数量来衡量网站的可见性会影响其被搜索引擎覆盖的机会。我们得出结论，确实存在覆盖偏差，但这不是由于搜索引擎的故意选择，而是由于美国网站在网络上累积优势效应的自然结果。然而，这种偏见仍然引起国际关注。

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