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	Effective Time Ratio: A Measure for Web Search Engines with Document Snippets
	He, Jing ; Shu, Baihan ; Li, Xiaoming ; Yan, Hongfei
	2010
关键词	Information retrieval evaluation metric snippet RETRIEVAL
英文摘要	The dominant method for evaluating search engines is the Cranfield paradigm, but the existing metrics do not consider sonic modern search engines features, such as document snippets. In this paper, we propose a new metric effective time ratio for search engine evaluation. Effective time ratio measures the ratio between effective time a user spent on getting relevant information and the total search time. For retrieval system without presenting document snippet, its value is identical to precision. For search engine with snippet, some theoretical analysis proves that its value can reflect both retrieval system performance and snippet quality. We further deploy a real user study, showing that effective time ratio can reflect users' satisfaction better than the existing metrics based on document relevance and/or snippet relevance.; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods; EI; CPCI-S(ISTP); 0
语种	英语
DOI标识	10.1007/978-3-642-17187-1_7
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/293046]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	He, Jing,Shu, Baihan,Li, Xiaoming,et al. Effective Time Ratio: A Measure for Web Search Engines with Document Snippets. 2010-01-01.

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