David Alexander

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David Alexander is an author.


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Title Keyword(s) Published in Language DateThis property is a special property in this wiki. Abstract R C
Click log based evaluation of link discovery Hypertext
Information retrieval
ADCS 2011 - Proceedings of the Sixteenth Australasian Document Computing Symposium English 2011 We introduce a set of new metrics for hyperlink quality. These metrics are based on users' interactions with hyperlinks as recorded in click logs. Using a year-long click log, we assess the INEX 2008 link discovery (Link-the-Wiki) runs and find that our metrics rank them differently from the existing metrics (INEX automatic and manual assessment), and that runs tend to perform well according to either our metrics or the existing ones, but not both. We conclude that user behaviour is influenced by more factors than are assessed in automatic and manual assessment, and that future link discovery strategies should take this into account. We also suggest ways in which our assessment method may someday replace automatic and manual assessment, and explain how this would benefit the quality of large-scale hypertext collections such as Wikipedia. 0 0
Overview of the INEX 2010 link the wiki track INEX English 2011 0 0
University student use of the Wikipedia Information retrieval
Link discovery
ADCS 2009 - Proceedings of the Fourteenth Australasian Document Computing Symposium English 2009 The 2008 proxy log covering all student access to the Wikipedia from the University of Otago is analysed. The log covers 17,635 student users for all 366 days in the year, amounting to over 577,973 user sessions. The analysis shows the Wikipedia is used every hour of the day, but seasonally. Use is low between semesters, rising steadily throughout the semester until it peaks at around exam time. The analysis of the articles that are retrieved as well as an analysis of which links are clicked shows that the Wikipedia is used for study-related purposes. Medical documents are popular reflecting the specialty of the university. The mean Wikipedia session length is about a minute and a half and consists of about three clicks. The click graph the users generated is compared to the link graph in the Wikipedia. In about 14% of the user sessions the user has chosen a sub-optimal path from the start of their session to the final document they view. In 33% the path is better than optimal suggesting that users prefer to search than to follow the link-graph. When they do click, they click links in the running text (93.6%) and rarely on "See Also" links (6.4%), but this bias disappears when the frequency of these types of links' occurrence is corrected for. Several recommendations for changes to the link discovery methodology are made. These changes include using highly viewed articles from the log as test data and using user clicks as user judgements. 0 0