Similarity	Concept
	Retrieval effectiveness
	Term
	Generality
	Index term
	Probabilistic retrieval
	Operational information retrieval
	Information measure
	Experimental information retrieval
	Theory of measurement

Pages with this concept

Similarity	Page	Snapshot
	120	convenience let us set There are a number of ways of looking at Ki ...Typically the weight Ki N,r,n,R is estimated from a contingency table in which N is not the total number of documents in the system but instead is some subset specifically chosen to enable Ki to be estimated ...The index terms are not independent Although it may be mathematically convenient to assume that the index terms are independent it by no means follows that it is realistic to do so ...
	134	which from a computational point of view would simplify things enormously ...An alternative way of using the dependence tree Association Hypothesis Some of the arguments advanced in the previous section can be construed as implying that the only dependence tree we have enough information to construct is the one on the entire document collection ...The basic idea underlying term clustering was explained in Chapter 2 ...If an index term is good at discriminating relevant from non relevantdocuments then any closely associated index term is also likely to begood at this ...