Library and Information Science

Library and Information Science ISSN: 2435-8495
三田図書館・情報学会 Mita Society for Library and Information Science
〒108‒8345 東京都港区三田2‒15‒45 慶應義塾大学文学部図書館・情報学専攻内 c/o Keio University, 2-15-45 Mita, Minato-ku, Tokyo 108-8345, Japan
https://mslis.jp/ E-mail:mita-slis@ml.keio.jp
Library and Information Science 37: 1-11 (1997)
doi:10.46895/lis.37.1

原著論文Original Article

インターネットのサーチエンジンの評価尺度ESL(expected search length)を使った検索実験A measure for evaluating search engines on the World Wide Web: Retrieval test with ESL (expected search length)

1慶應義塾大学大学院文学研究科図書館・情報学専攻Graduate School of Library and Information Science, Keio University ◇ 〒108-8345 東京都港区三田二丁目15番45号 ◇ Mita 2-15-45, Minato-ku, Tokyo 108-8345, Japan

2鉄道総合技術研究所輸送システム開発推進部Division of Transport Systems Development, Railway Technical Research Institute ◇ 〒185-8540 東京都国分寺市光町二丁目8番地38 ◇ Hikaricho 2-8-38, Kokubunji, Tokyo 185-8540, Japan

3慶鷹義塾大学文学部図書館・情報学科School of Library and Information Science, Keio University ◇ 〒108-8345 東京都港区三田二丁目15番45号 ◇ Mita 2-15-45, Minato-ku, Tokyo 108-8345, Japan

受付日:1998年1月27日Received: January 27, 1998
受理日:1998年9月8日Accepted: September 8, 1998
発行日:1998年9月30日Published: September 30, 1998
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Search engines are a kind of information retrieval systems on the Internet. However, they cannot be evaluated with the measures commonly applied in traditional retrieval experiments, i.e., recall and precision, since recall cannot be calculated in the essentially unrestricted resources of the Internet. The Expected Search Length (ESL) proposed by Cooper in 1968 is a measure for evaluating information retrieval systems and has the possibility of taking the place of recall and precision. The ESL calculates the cost paid by a user, i.e., number of retrieved sites the user must look through before (s)he gets sufficient number of relevant sites. This article proposes a version of the ESL in order to adapt it to evaluate search engines. An experiment was carried out to compare the validity of the ESL with that of precision and recall. Eight search engines of the domestic and overseas were evaluated by precision and ESL. The result of this retrieval experiment shows the adaptability of ESL for the evaluation of the search engines.

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