-
Egghe, L.; Rousseau, R.: Averaging and globalising quotients of informetric and scientometric data (1996)
0.02
0.016432095 = product of:
0.03286419 = sum of:
0.03286419 = product of:
0.049296286 = sum of:
0.012098727 = weight(_text_:a in 7659) [ClassicSimilarity], result of:
0.012098727 = score(doc=7659,freq=18.0), product of:
0.052761257 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.045758117 = queryNorm
0.22931081 = fieldWeight in 7659, product of:
4.2426405 = tf(freq=18.0), with freq of:
18.0 = termFreq=18.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=7659)
0.03719756 = weight(_text_:22 in 7659) [ClassicSimilarity], result of:
0.03719756 = score(doc=7659,freq=2.0), product of:
0.16023713 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045758117 = queryNorm
0.23214069 = fieldWeight in 7659, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=7659)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- It is possible, using ISI's Journal Citation Report (JCR), to calculate average impact factors (AIF) for LCR's subject categories but it can be more useful to know the global Impact Factor (GIF) of a subject category and compare the 2 values. Reports results of a study to compare the relationships between AIFs and GIFs of subjects, based on the particular case of the average impact factor of a subfield versus the impact factor of this subfield as a whole, the difference being studied between an average of quotients, denoted as AQ, and a global average, obtained as a quotient of averages, and denoted as GQ. In the case of impact factors, AQ becomes the average impact factor of a field, and GQ becomes its global impact factor. Discusses a number of applications of this technique in the context of informetrics and scientometrics
- Source
- Journal of information science. 22(1996) no.3, S.165-170
- Type
- a
-
Egghe, L.; Rousseau, R.: Topological aspects of information retrieval (1998)
0.00
0.0020747366 = product of:
0.0041494733 = sum of:
0.0041494733 = product of:
0.01244842 = sum of:
0.01244842 = weight(_text_:a in 2157) [ClassicSimilarity], result of:
0.01244842 = score(doc=2157,freq=14.0), product of:
0.052761257 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.045758117 = queryNorm
0.23593865 = fieldWeight in 2157, product of:
3.7416575 = tf(freq=14.0), with freq of:
14.0 = termFreq=14.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=2157)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Abstract
- Let (DS, DQ, sim) be a retrieval system consisting of a document space DS, a query space QS, and a function sim, expressing the similarity between a document and a query. Following D.M. Everett and S.C. Cater (1992), we introduce topologies on the document space. These topologies are generated by the similarity function sim and the query space QS. 3 topologies will be studied: the retrieval topology, the similarity topology and the (pseudo-)metric one. It is shown that the retrieval topology is the coarsest of the three, while the (pseudo-)metric is the strongest. These 3 topologies are generally different, reflecting distinct topological aspects of information retrieval. We present necessary and sufficient conditions for these topological aspects to be equal
- Type
- a
-
Egghe, L.; Rousseau, R.: ¬A theoretical study of recall and precision using a topological approach to information retrieval (1998)
0.00
0.0015522675 = product of:
0.003104535 = sum of:
0.003104535 = product of:
0.009313605 = sum of:
0.009313605 = weight(_text_:a in 3267) [ClassicSimilarity], result of:
0.009313605 = score(doc=3267,freq=6.0), product of:
0.052761257 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.045758117 = queryNorm
0.17652355 = fieldWeight in 3267, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0625 = fieldNorm(doc=3267)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Type
- a
-
Egghe, L.; Rousseau, R.: Duality in information retrieval and the hypegeometric distribution (1997)
0.00
8.9620193E-4 = product of:
0.0017924039 = sum of:
0.0017924039 = product of:
0.0053772116 = sum of:
0.0053772116 = weight(_text_:a in 647) [ClassicSimilarity], result of:
0.0053772116 = score(doc=647,freq=2.0), product of:
0.052761257 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.045758117 = queryNorm
0.10191591 = fieldWeight in 647, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0625 = fieldNorm(doc=647)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Type
- a