-
Robertson, S.E.: Indexing theory and retrieval effectiveness (1979)
0.02
0.018542625 = product of:
0.055627875 = sum of:
0.055627875 = product of:
0.16688362 = sum of:
0.16688362 = weight(_text_:theory in 5175) [ClassicSimilarity], result of:
0.16688362 = score(doc=5175,freq=2.0), product of:
0.18161562 = queryWeight, product of:
4.1583924 = idf(docFreq=1878, maxDocs=44218)
0.04367448 = queryNorm
0.9188836 = fieldWeight in 5175, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.1583924 = idf(docFreq=1878, maxDocs=44218)
0.15625 = fieldNorm(doc=5175)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
-
Robertson, S.E.: Some recent theories and models in information retrieval (1980)
0.01
0.011125575 = product of:
0.033376724 = sum of:
0.033376724 = product of:
0.10013017 = sum of:
0.10013017 = weight(_text_:theory in 1326) [ClassicSimilarity], result of:
0.10013017 = score(doc=1326,freq=2.0), product of:
0.18161562 = queryWeight, product of:
4.1583924 = idf(docFreq=1878, maxDocs=44218)
0.04367448 = queryNorm
0.55133015 = fieldWeight in 1326, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.1583924 = idf(docFreq=1878, maxDocs=44218)
0.09375 = fieldNorm(doc=1326)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
- Source
- Theory and application of information research. Proc. of the 2nd Int. Research Forum on Information Science, 3.-6.8.1977, Copenhagen. Ed.: O. Harbo u. L. Kajberg
-
Sparck Jones, K.; Walker, S.; Robertson, S.E.: ¬A probabilistic model of information retrieval : development and comparative experiments - part 1 (2000)
0.01
0.0079613365 = product of:
0.02388401 = sum of:
0.02388401 = product of:
0.071652025 = sum of:
0.071652025 = weight(_text_:29 in 4181) [ClassicSimilarity], result of:
0.071652025 = score(doc=4181,freq=2.0), product of:
0.15363316 = queryWeight, product of:
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.04367448 = queryNorm
0.46638384 = fieldWeight in 4181, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.09375 = fieldNorm(doc=4181)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
- Date
- 27.12.2007 19:27:29
-
Robertson, S.E.: Theories and models in information retrieval (1977)
0.01
0.00741705 = product of:
0.02225115 = sum of:
0.02225115 = product of:
0.06675345 = sum of:
0.06675345 = weight(_text_:theory in 1844) [ClassicSimilarity], result of:
0.06675345 = score(doc=1844,freq=2.0), product of:
0.18161562 = queryWeight, product of:
4.1583924 = idf(docFreq=1878, maxDocs=44218)
0.04367448 = queryNorm
0.36755344 = fieldWeight in 1844, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.1583924 = idf(docFreq=1878, maxDocs=44218)
0.0625 = fieldNorm(doc=1844)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
- Abstract
- This paper is concerned with recent work in the theory of information retrieval. More particularly, it is concerned with theories which tackle the problem of retrieval performance, in a sense which will be explained. The aim is not an exhaustive survey of such work; rather it is an analysis and synthesis of those contributions which I feel to be important or find interesting
-
Robertson, S.E.; Sparck Jones, K.: Relevance weighting of search terms (1976)
0.01
0.00741705 = product of:
0.02225115 = sum of:
0.02225115 = product of:
0.06675345 = sum of:
0.06675345 = weight(_text_:theory in 71) [ClassicSimilarity], result of:
0.06675345 = score(doc=71,freq=2.0), product of:
0.18161562 = queryWeight, product of:
4.1583924 = idf(docFreq=1878, maxDocs=44218)
0.04367448 = queryNorm
0.36755344 = fieldWeight in 71, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.1583924 = idf(docFreq=1878, maxDocs=44218)
0.0625 = fieldNorm(doc=71)
0.33333334 = coord(1/3)
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
-
MacFarlane, A.; Robertson, S.E.; McCann, J.A.: Parallel computing for passage retrieval (2004)
0.01
0.005259813 = product of:
0.015779437 = sum of:
0.015779437 = product of:
0.04733831 = sum of:
0.04733831 = weight(_text_:22 in 5108) [ClassicSimilarity], result of:
0.04733831 = score(doc=5108,freq=2.0), product of:
0.15294059 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04367448 = queryNorm
0.30952093 = fieldWeight in 5108, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=5108)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
- Date
- 20. 1.2007 18:30:22
-
Vechtomova, O.; Robertson, S.E.: ¬A domain-independent approach to finding related entities (2012)
0.00
0.0039806683 = product of:
0.011942005 = sum of:
0.011942005 = product of:
0.035826012 = sum of:
0.035826012 = weight(_text_:29 in 2733) [ClassicSimilarity], result of:
0.035826012 = score(doc=2733,freq=2.0), product of:
0.15363316 = queryWeight, product of:
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.04367448 = queryNorm
0.23319192 = fieldWeight in 2733, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.046875 = fieldNorm(doc=2733)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
- Date
- 27. 1.2016 18:44:29