期刊名称：International Journal of Computer and Information Technology
印刷版ISSN：2279-0764
出版年度：2017
卷号：6
期号：2
页码：75-83
出版社：International Journal of Computer and Information Technology
摘要：Authority identification is an important problem in
online information-sharing communities such as question-answer
(Q&A) forums and online social networks (OSNs), where users
care as much about the quality of information being accessed, as
its alignment with their interests. This paper investigates a
tournament model based approach to authority identification,
where interactions between users are modeled as generated by a
Bradley-Terry model. We derive a new measure of user
authority, the average winnings score, for authority identification
in Q&A forums, and evaluate it on data derived from the Stack
Exchange Q&A forum. We also show how the log fair bets
measure, which has been successfully used for authority
identification in OSNs in the past, can be derived from
tournament models. We also prove some key results related to a
co-ranking framework, for combining information from multiple
preference expression graphs based on the same OSN. We then
demonstrate the empirical effectiveness of tournament model
based approaches, in conjunction with the co-ranking
framework.
