Robertson, S.E.: On relevance weight estimation and query expansion (1986)
0.03
0.025710084 = product of:
0.06856022 = sum of:
0.04174695 = weight(_text_:retrieval in 3875) [ClassicSimilarity], result of:
0.04174695 = score(doc=3875,freq=2.0), product of:
0.124912694 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.041294612 = 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)
0.015778005 = weight(_text_:of in 3875) [ClassicSimilarity], result of:
0.015778005 = score(doc=3875,freq=4.0), product of:
0.06457475 = queryWeight, product of:
1.5637573 = idf(docFreq=25162, maxDocs=44218)
0.041294612 = 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)
0.0110352645 = product of:
0.022070529 = sum of:
0.022070529 = weight(_text_:on in 3875) [ClassicSimilarity], result of:
0.022070529 = score(doc=3875,freq=2.0), product of:
0.090823986 = queryWeight, product of:
2.199415 = idf(docFreq=13325, maxDocs=44218)
0.041294612 = 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