Rijsbergen, C.J. van: ¬A test for the separation of relevant and non-relevant documents in experimental retrieval collections (1973)
0.05
0.04577866 = product of:
0.11444665 = sum of:
0.05272096 = weight(_text_:system in 5002) [ClassicSimilarity], result of:
0.05272096 = score(doc=5002,freq=4.0), product of:
0.13391352 = queryWeight, product of:
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.04251826 = queryNorm
0.3936941 = fieldWeight in 5002, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.0625 = fieldNorm(doc=5002)
0.061725687 = product of:
0.09258853 = sum of:
0.04650343 = weight(_text_:29 in 5002) [ClassicSimilarity], result of:
0.04650343 = score(doc=5002,freq=2.0), product of:
0.14956595 = queryWeight, product of:
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.04251826 = queryNorm
0.31092256 = fieldWeight in 5002, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5176873 = idf(docFreq=3565, maxDocs=44218)
0.0625 = fieldNorm(doc=5002)
0.046085097 = weight(_text_:22 in 5002) [ClassicSimilarity], result of:
0.046085097 = score(doc=5002,freq=2.0), product of:
0.1488917 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04251826 = queryNorm
0.30952093 = fieldWeight in 5002, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=5002)
0.6666667 = coord(2/3)
0.4 = coord(2/5)
- Abstract
- Many retrievalexperiments are intended to discover ways of improving performance, taking the results obtained with some particular technique as a baseline. The fact that substantial alterations to a system often have little or no effect on particular collections is puzzling. This may be due to the initially poor seperation of relevant and non-relevant documents. The paper presents a procedure for characterizing this seperation for a collection, which can be used to show whether proposed modifications of the base system are likely to be useful.
- Date
- 19. 3.1996 11:22:12
- Source
- Journal of documentation. 29(1973) no.3, S.251-257