-
Robertson, S.E.; Sparck Jones, K.: Relevance weighting of search terms (1976)
0.00
0.004175565 = product of:
0.012526695 = sum of:
0.012526695 = product of:
0.02505339 = sum of:
0.02505339 = weight(_text_:of in 71) [ClassicSimilarity], result of:
0.02505339 = score(doc=71,freq=14.0), product of:
0.06850986 = queryWeight, product of:
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.043811057 = queryNorm
0.36569026 = fieldWeight in 71, product of:
3.7416575 = tf(freq=14.0), with freq of:
14.0 = termFreq=14.0
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.0625 = fieldNorm(doc=71)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- Examines statistical techniques for exploiting relevance information to weight search terms. These techniques are presented as a natural extension of weighting methods using information about the distribution of index terms in documents in general. A series of relevance weighting functions is derived and is justified by theoretical considerations. In particular, it is shown that specific weighted search methods are implied by a general probabilistic theory of retrieval. Different applications of relevance weighting are illustrated by experimental results for test collections
- Source
- Journal of the American Society for Information Science. 27(1976), S.129-146
-
Sparck Jones, K.; Walker, S.; Robertson, S.E.: ¬A probabilistic model of information retrieval : development and comparative experiments - part 1 (2000)
0.00
0.0023673228 = product of:
0.0071019684 = sum of:
0.0071019684 = product of:
0.014203937 = sum of:
0.014203937 = weight(_text_:of in 4181) [ClassicSimilarity], result of:
0.014203937 = score(doc=4181,freq=2.0), product of:
0.06850986 = queryWeight, product of:
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.043811057 = queryNorm
0.20732689 = fieldWeight in 4181, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.09375 = fieldNorm(doc=4181)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
-
Sparck Jones, K.; Walker, S.; Robertson, S.E.: ¬A probabilistic model of information retrieval : development and comparative experiments - part 2 (2000)
0.00
0.0023673228 = product of:
0.0071019684 = sum of:
0.0071019684 = product of:
0.014203937 = sum of:
0.014203937 = weight(_text_:of in 4286) [ClassicSimilarity], result of:
0.014203937 = score(doc=4286,freq=2.0), product of:
0.06850986 = queryWeight, product of:
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.043811057 = queryNorm
0.20732689 = fieldWeight in 4286, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.09375 = fieldNorm(doc=4286)
0.5 = coord(1/2)
0.33333334 = coord(1/3)