Walker, S.; DeVere, R.: Improving subject retrieval in online catalogues : T.2: Relevance feedback and query expansion (1990)
0.00
0.0010352366 = product of:
0.010352367 = sum of:
0.010352367 = product of:
0.031057099 = sum of:
0.031057099 = weight(_text_:online in 1816) [ClassicSimilarity], result of:
0.031057099 = score(doc=1816,freq=2.0), product of:
0.09262139 = queryWeight, product of:
3.0349014 = idf(docFreq=5778, maxDocs=44218)
0.03051875 = queryNorm
0.33531237 = fieldWeight in 1816, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.0349014 = idf(docFreq=5778, maxDocs=44218)
0.078125 = fieldNorm(doc=1816)
0.33333334 = coord(1/3)
0.1 = coord(1/10)
