NTCIR-5 WEB Navi-2 Experiments at Osaka Kyoiku University - Page, Anchor and Title Indexing, and In-link Count, Inter Page and Inter Site Link Analyses

This paper describes experimental results of WEB Navigational Retrieval Subtask 2 (WEB Navi-2). We made three gram-based indices, namely indices for text in whole page, text in title tag and text in anchor tag. Since gram-based indices are able to index all strings in target text, words that are not found in dictionaries are also indexed essentially. We used words in TITLE tag of search topics as queries. We did three kinds of link analyses, that is, in-link count and inter site and inter page link analysis. We merged score from word search for three indices and score from link analyses variously. We found that anchor text analysis was most effective for WEB Navi-2, and that it is necessary to devise merging of page and/or title score to anchor score.