UMD LBSC 796 - Relevance Feedback (10 pages)

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Relevance Feedback



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Relevance Feedback

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Lecture Notes


Pages:
10
School:
University of Maryland, College Park
Course:
Lbsc 796 - Information Retrieval Systems

Unformatted text preview:

The IR Black Box LBSC 796 INFM 718R Week 8 Relevance Feedback Query Search Ranked List Jimmy Lin College of Information Studies University of Maryland Monday March 27 2006 Anomalous State of Knowledge Basic paradox z z z Information needs arise because the user doesn t know something an anomaly in his state of knowledge with respect to the problem faced Search systems are designed to satisfy these needs but the user needs to know what he is looking for However if the user knows what he s looking for there may not be a need to search in the first place Implication computing similarity between queries and documents is fundamentally wrong How do we resolve this paradox The Information Retrieval Cycle Source Selection Resource Query Formulation Query Search Ranked List Selection System discovery Vocabulary discovery Concept discovery Document discovery Documents Examination source reselection Documents Delivery Nicholas J Belkin 1980 Anomalous States of Knowledge as a Basis for Information Retrieval Canadian Journal of Information Science 5 133 143 Upcoming Topics Source Selection Different Types of Interactions Resource Next Week Query Formulation Today System discovery Vocabulary discovery Concept discovery Document discovery source reselection z Query Search System discovery learning capabilities of the system z Ranked List Selection Vocabulary discovery learning collectionspecific terms that relate to your information need z Documents z Examination Playing with different types of query operators Reverse engineering a search system The literature on aerodynamics refers to aircrafts but you query on planes How do you know what terms the collection uses Documents Delivery 1 Different Types of Interactions Concept discovery learning the concepts that relate to your information need z z Relevance Feedback What s the name of the disease that Reagan had How is this different from vocabulary discovery z z Document discovery learning about the types of documents that fulfill



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