Has portfolio theory got any principles?

Guido Zuccon, Leif Azzopardi, C.J. "Keith" van Rijsbergen

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

3 Citations (Scopus)


Recently, Portfolio Theory (PT) has been proposed for Information Retrieval. However, under non-trivial conditions PT violates the original Probability Ranking Principle (PRP). In this poster, we shall explore whether PT upholds a different ranking principle based on Quantum Theory, i.e. the Quantum Probability Ranking Principle (QPRP), and examine the relationship between this new model and the new ranking principle. We make a significant contribution to the theoretical development of PT and show that under certain circumstances PT upholds the QPRP, and thus guarantees an optimal ranking according to the QPRP. A practical implication of this finding is that the parameters of PT can be automatically estimated via the QPRP, instead of resorting to extensive parameter tuning.
Original languageEnglish
Title of host publicationSIGIR '10 Proceedings of the 33rd International ACM SIGIR Conference on Research and Development in Information Retrieval
Place of PublicationNew York, NY, USA
Number of pages2
Publication statusPublished - 19 Jul 2010
Externally publishedYes


  • interdependent document relevance
  • quantum probability ranking principle
  • portfolio theory for IR
  • information retrieval


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