Similarity	Concept
	Data retrieval systems
	Document representative
	Cluster based retrieval
	Information retrieval system
	Probabilistic retrieval
	Document clustering
	File structures
	Sequential file
	Retrieval effectiveness
	Typical document

Pages with this concept

Similarity	Page	Snapshot
	129	we work with the ratio In the latter case we do not see the retrieval problem as one of discriminating between relevant and non relevant documents,instead we merely wish to compute the P relevance x for each document x and present the user with documents in decreasing order of this probability ...The decision rules derived above are couched in terms of P x wi ...I will now proceed to discuss ways of using this probabilistic model of retrieval and at the same time discuss some of the practical problems that arise ...The curse of dimensionality In deriving the decision rules I assumed that a document is represented by an n dimensional vector where n is the size of the index term vocabulary ...
	91	A description of the use of a sequential file in an on line environment may be found in Negus and Hall [36]...Work on tree structures in IR goes back a long way as illustrated by the early papers by Salton [43]where not only methods of construction are discussed but also techniques of reorganisation ...More recently a special kind of tree,called a trie,has attracted attention ...The use of hashing in document retrieval is dealt with in Higgins and Smith [50]...It has become fashionable to refer to document collections which