Van der Walt, H.E.A.; Brakel, P.A. van: Method for the evaluation of the retrieval effectiveness of a CD-ROM bibliographic database (1991)
0.15
0.14755374 = product of:
0.2213306 = sum of:
0.14855316 = weight(_text_:p.a in 3114) [ClassicSimilarity], result of:
0.14855316 = score(doc=3114,freq=2.0), product of:
0.28669828 = queryWeight, product of:
6.699675 = idf(docFreq=147, maxDocs=44218)
0.042792864 = queryNorm
0.5181516 = fieldWeight in 3114, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
6.699675 = idf(docFreq=147, maxDocs=44218)
0.0546875 = fieldNorm(doc=3114)
0.072777435 = product of:
0.14555487 = sum of:
0.14555487 = weight(_text_:van in 3114) [ClassicSimilarity], result of:
0.14555487 = score(doc=3114,freq=4.0), product of:
0.23863824 = queryWeight, product of:
5.5765896 = idf(docFreq=454, maxDocs=44218)
0.042792864 = queryNorm
0.60993946 = fieldWeight in 3114, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
5.5765896 = idf(docFreq=454, maxDocs=44218)
0.0546875 = fieldNorm(doc=3114)
0.5 = coord(1/2)
0.6666667 = coord(2/3)