A query-basis approach to parametrizing novelty-biased cumulative gain
Leelanupab, Teerapong, Zuccon, Guido, & Jose, Joemon M. (2011) A query-basis approach to parametrizing novelty-biased cumulative gain. Lecture Notes in Computer Science : Advances in Information Retrieval Theory, 6931, pp. 327-331.
Novelty-biased cumulative gain (α-NDCG) has become the de facto measure within the information retrieval (IR) community for evaluating retrieval systems in the context of sub-topic retrieval. Setting the incorrect value of parameter α in α-NDCG prevents the measure from behaving as desired in particular circumstances. In fact, when α is set according to common practice (i.e. α = 0.5), the measure favours systems that promote redundant relevant sub-topics rather than provide novel relevant ones. Recognising this characteristic of the measure is important because it affects the comparison and the ranking of retrieval systems. We propose an approach to overcome this problem by defining a safe threshold for the value of α on a query basis. Moreover, we study its impact on system rankings through a comprehensive simulation.
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|Item Type:||Journal Article|
|Additional Information:||Book Subtitle:
Third International Conference, ICTIR 2011, Bertinoro, Italy, September 12-14, 2011. Proceedings
|Keywords:||Diversity, Sub-topic retrieval, Effectiveness measure, Web search|
|Divisions:||Current > Schools > School of Information Systems
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||29 May 2014 22:31|
|Last Modified:||03 Aug 2014 08:56|
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