-
Robertson, S.E.: Some recent theories and models in information retrieval (1980)
0.03
0.03181018 = product of:
0.08482715 = sum of:
0.05165203 = weight(_text_:retrieval in 1326) [ClassicSimilarity], result of:
0.05165203 = score(doc=1326,freq=2.0), product of:
0.12879172 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.042576972 = queryNorm
0.40105087 = fieldWeight in 1326, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.09375 = fieldNorm(doc=1326)
0.01952157 = weight(_text_:of in 1326) [ClassicSimilarity], result of:
0.01952157 = score(doc=1326,freq=4.0), product of:
0.06658005 = queryWeight, product of:
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.042576972 = queryNorm
0.2932045 = fieldWeight in 1326, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.09375 = fieldNorm(doc=1326)
0.013653545 = product of:
0.02730709 = sum of:
0.02730709 = weight(_text_:on in 1326) [ClassicSimilarity], result of:
0.02730709 = score(doc=1326,freq=2.0), product of:
0.09364443 = queryWeight, product of:
2.199415 = idf(docFreq=13325, maxDocs=44218)
0.042576972 = queryNorm
0.29160398 = fieldWeight in 1326, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.199415 = idf(docFreq=13325, maxDocs=44218)
0.09375 = fieldNorm(doc=1326)
0.5 = coord(1/2)
0.375 = coord(3/8)
- 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
-
Robertson, S.E.: ¬The methodology of information retrieval experiment (1981)
0.03
0.028950278 = product of:
0.11580111 = sum of:
0.097396 = weight(_text_:retrieval in 3146) [ClassicSimilarity], result of:
0.097396 = score(doc=3146,freq=4.0), product of:
0.12879172 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.042576972 = queryNorm
0.75622874 = fieldWeight in 3146, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.125 = fieldNorm(doc=3146)
0.018405113 = weight(_text_:of in 3146) [ClassicSimilarity], result of:
0.018405113 = score(doc=3146,freq=2.0), product of:
0.06658005 = queryWeight, product of:
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.042576972 = queryNorm
0.27643585 = fieldWeight in 3146, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.125 = fieldNorm(doc=3146)
0.25 = coord(2/8)
- Source
- Information retrieval experiment. Ed.: K. Sparck Jones
-
Robertson, S.E.: On relevance weight estimation and query expansion (1986)
0.03
0.026508484 = product of:
0.07068929 = sum of:
0.04304336 = weight(_text_:retrieval in 3875) [ClassicSimilarity], result of:
0.04304336 = score(doc=3875,freq=2.0), product of:
0.12879172 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.042576972 = queryNorm
0.33420905 = fieldWeight in 3875, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.078125 = fieldNorm(doc=3875)
0.016267976 = weight(_text_:of in 3875) [ClassicSimilarity], result of:
0.016267976 = score(doc=3875,freq=4.0), product of:
0.06658005 = queryWeight, product of:
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.042576972 = queryNorm
0.24433708 = fieldWeight in 3875, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.078125 = fieldNorm(doc=3875)
0.011377954 = product of:
0.022755908 = sum of:
0.022755908 = weight(_text_:on in 3875) [ClassicSimilarity], result of:
0.022755908 = score(doc=3875,freq=2.0), product of:
0.09364443 = queryWeight, product of:
2.199415 = idf(docFreq=13325, maxDocs=44218)
0.042576972 = queryNorm
0.24300331 = fieldWeight in 3875, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.199415 = idf(docFreq=13325, maxDocs=44218)
0.078125 = fieldNorm(doc=3875)
0.5 = coord(1/2)
0.375 = coord(3/8)
- Abstract
- A Bayesian argument is used to suggest modifications to the Robertson/Sparck Jones relevance weighting formula, to accomodate the addition to the query of terms taken from the relevant documents identified during the search
- Source
- Journal of documentation. 42(1986), S.182-188
- Theme
- Semantisches Umfeld in Indexierung u. Retrieval
-
Robertson, S.E.; Thompson, C.L.: ¬An operational evaluation of weighting, ranking and relevance feedback via a front-end system (1987)
0.00
0.002013059 = product of:
0.016104473 = sum of:
0.016104473 = weight(_text_:of in 3858) [ClassicSimilarity], result of:
0.016104473 = score(doc=3858,freq=2.0), product of:
0.06658005 = queryWeight, product of:
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.042576972 = queryNorm
0.24188137 = fieldWeight in 3858, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.109375 = fieldNorm(doc=3858)
0.125 = coord(1/8)
-
Bovey, J.D.; Robertson, S.E.: ¬An algorithm for weighted searching on a Boolean system (1984)
0.00
0.0019911418 = product of:
0.015929135 = sum of:
0.015929135 = product of:
0.03185827 = sum of:
0.03185827 = weight(_text_:on in 788) [ClassicSimilarity], result of:
0.03185827 = score(doc=788,freq=2.0), product of:
0.09364443 = queryWeight, product of:
2.199415 = idf(docFreq=13325, maxDocs=44218)
0.042576972 = queryNorm
0.34020463 = fieldWeight in 788, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.199415 = idf(docFreq=13325, maxDocs=44218)
0.109375 = fieldNorm(doc=788)
0.5 = coord(1/2)
0.125 = coord(1/8)
