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)
0.08
0.07866113 = product of:
0.15732226 = sum of:
0.14887685 = weight(_text_:van in 3114) [ClassicSimilarity], result of:
0.14887685 = score(doc=3114,freq=4.0), product of:
0.24408463 = queryWeight, product of:
5.5765896 = idf(docFreq=454, maxDocs=44218)
0.043769516 = 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)
0.008445405 = product of:
0.01689081 = sum of:
0.01689081 = weight(_text_:der in 3114) [ClassicSimilarity], result of:
0.01689081 = score(doc=3114,freq=2.0), product of:
0.09777089 = queryWeight, product of:
2.2337668 = idf(docFreq=12875, maxDocs=44218)
0.043769516 = queryNorm
0.17275909 = fieldWeight in 3114, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.2337668 = idf(docFreq=12875, maxDocs=44218)
0.0546875 = fieldNorm(doc=3114)
0.5 = coord(1/2)
0.5 = coord(2/4)