Prof. Dr. Knut Hinkelmann 38 Information Retrieval and Knowledge Organisation - 2 Information Retrieval Drawbacks of the Boolean Model Retrieval based
{"Image DocumentName": "Drawbacks of the Boolean Model", "Image ImageDescription": "Retrieval based on binary decision criteria. no notion of partial matching. No ranking of the documents is provided (absence of a grading scale) The query q = t1 OR t2 OR t3 is satisfied by document containing one, two or three of the terms t1, t2, t3. No weighting of terms, wij \u00ce {0,1} Information need has to be translated into a Boolean expression which most users find awkward. The Boolean queries formulated by the users are most often too simplistic. As a consequence, the Boolean model frequently returns either too few or too many documents in response to a user query. Information Retrieval and Knowledge Organisation - 2 Information Retrieval.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}