{"id":157320,"date":"2009-04-09T00:00:00","date_gmt":"2009-04-09T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/measuring-the-search-effectiveness-of-a-breadth-first-crawl\/"},"modified":"2018-10-16T21:56:26","modified_gmt":"2018-10-17T04:56:26","slug":"measuring-the-search-effectiveness-of-a-breadth-first-crawl","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/measuring-the-search-effectiveness-of-a-breadth-first-crawl\/","title":{"rendered":"Measuring the Search Effectiveness of a Breadth-First Crawl"},"content":{"rendered":"<div class=\"asset-content\">\n<p>Previous scalability experiments found that early precision improves as collection size increases. However, that was under the assumption that a collection&#8217;s documents are all sampled with uniform probability from the same population.  We contrast this to a large breadth-first web crawl, an important scenario in real-world Web search, where the early documents have quite different characteristics from the later documents. Having observed that NDCG@100 (measured over a set of reference queries) begins to plateau in the initial stages of the crawl, we investigate a number of possible reasons for this behaviour. These include the web-pages themselves, the metric used to measure retrieval effectiveness as well as the set of relevance judgements used.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Previous scalability experiments found that early precision improves as collection size increases. However, that was under the assumption that a collection&#8217;s documents are all sampled with uniform probability from the same population. We contrast this to a large breadth-first web crawl, an important scenario in real-world Web search, where the early documents have quite different [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","footnotes":""},"msr-content-type":[3],"msr-research-highlight":[],"research-area":[13555],"msr-publication-type":[193716],"msr-product-type":[],"msr-focus-area":[],"msr-platform":[],"msr-download-source":[],"msr-locale":[268875],"msr-post-option":[],"msr-field-of-study":[],"msr-conference":[],"msr-journal":[],"msr-impact-theme":[],"msr-pillar":[],"class_list":["post-157320","msr-research-item","type-msr-research-item","status-publish","hentry","msr-research-area-search-information-retrieval","msr-locale-en_us"],"msr_publishername":"Springer Verlag","msr_edition":"Proceedings of the 31st European Conference on 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