-
Leydesdorff, L.: ¬The construction and globalization of the knowledge base in inter-human communication systems (2003)
0.03
0.029757919 = product of:
0.059515838 = sum of:
0.059515838 = sum of:
0.0035862487 = weight(_text_:s in 1621) [ClassicSimilarity], result of:
0.0035862487 = score(doc=1621,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 1621, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=1621)
0.018726287 = weight(_text_:h in 1621) [ClassicSimilarity], result of:
0.018726287 = score(doc=1621,freq=2.0), product of:
0.11370127 = queryWeight, product of:
2.4844491 = idf(docFreq=10020, maxDocs=44218)
0.045765184 = queryNorm
0.16469726 = fieldWeight in 1621, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.4844491 = idf(docFreq=10020, maxDocs=44218)
0.046875 = fieldNorm(doc=1621)
0.0372033 = weight(_text_:22 in 1621) [ClassicSimilarity], result of:
0.0372033 = score(doc=1621,freq=2.0), product of:
0.16026187 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045765184 = queryNorm
0.23214069 = fieldWeight in 1621, 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=1621)
0.5 = coord(1/2)
- Date
- 22. 5.2003 19:48:04
- Source
- Canadian Journal of Communication 28(2003), H.3, S. -
-
Leydesdorff, L.: Can networks of journal-journal citations be used as indicators of change in the social sciences? (2003)
0.01
0.013596516 = product of:
0.027193032 = sum of:
0.027193032 = product of:
0.04078955 = sum of:
0.0035862487 = weight(_text_:s in 4460) [ClassicSimilarity], result of:
0.0035862487 = score(doc=4460,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 4460, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=4460)
0.0372033 = weight(_text_:22 in 4460) [ClassicSimilarity], result of:
0.0372033 = score(doc=4460,freq=2.0), product of:
0.16026187 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045765184 = queryNorm
0.23214069 = fieldWeight in 4460, 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=4460)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Date
- 6.11.2005 19:02:22
- Source
- Journal of documentation. 59(2003) no.1, S.84-104
-
Leydesdorff, L.; Sun, Y.: National and international dimensions of the Triple Helix in Japan : university-industry-government versus international coauthorship relations (2009)
0.01
0.013596516 = product of:
0.027193032 = sum of:
0.027193032 = product of:
0.04078955 = sum of:
0.0035862487 = weight(_text_:s in 2761) [ClassicSimilarity], result of:
0.0035862487 = score(doc=2761,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 2761, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=2761)
0.0372033 = weight(_text_:22 in 2761) [ClassicSimilarity], result of:
0.0372033 = score(doc=2761,freq=2.0), product of:
0.16026187 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045765184 = queryNorm
0.23214069 = fieldWeight in 2761, 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=2761)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Date
- 22. 3.2009 19:07:20
- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.4, S.778-788
-
Leydesdorff, L.: How are new citation-based journal indicators adding to the bibliometric toolbox? (2009)
0.01
0.0074375123 = product of:
0.014875025 = sum of:
0.014875025 = product of:
0.022312537 = sum of:
0.0035862487 = weight(_text_:s in 2929) [ClassicSimilarity], result of:
0.0035862487 = score(doc=2929,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 2929, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=2929)
0.018726287 = weight(_text_:h in 2929) [ClassicSimilarity], result of:
0.018726287 = score(doc=2929,freq=2.0), product of:
0.11370127 = queryWeight, product of:
2.4844491 = idf(docFreq=10020, maxDocs=44218)
0.045765184 = queryNorm
0.16469726 = fieldWeight in 2929, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.4844491 = idf(docFreq=10020, maxDocs=44218)
0.046875 = fieldNorm(doc=2929)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Abstract
- The launching of Scopus and Google Scholar, and methodological developments in social-network analysis have made many more indicators for evaluating journals available than the traditional impact factor, cited half-life, and immediacy index of the ISI. In this study, these new indicators are compared with one another and with the older ones. Do the various indicators measure new dimensions of the citation networks, or are they highly correlated among themselves? Are they robust and relatively stable over time? Two main dimensions are distinguished - size and impact - which together shape influence. The h-index combines the two dimensions and can also be considered as an indicator of reach (like Indegree). PageRank is mainly an indicator of size, but has important interactions with centrality measures. The Scimago Journal Ranking (SJR) indicator provides an alternative to the journal impact factor, but the computation is less easy.
- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.7, S.1327-1336
-
Leydesdorff, L.: Should co-occurrence data be normalized : a rejoinder (2007)
0.00
0.0011954163 = product of:
0.0023908326 = sum of:
0.0023908326 = product of:
0.0071724975 = sum of:
0.0071724975 = weight(_text_:s in 627) [ClassicSimilarity], result of:
0.0071724975 = score(doc=627,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.14414869 = fieldWeight in 627, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.09375 = fieldNorm(doc=627)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 58(2007) no.14, S.2411-2413
-
Leydesdorff, L.: ¬A sociological theory of communication : the self-organization of the knowledge-based society (2001)
0.00
8.45287E-4 = product of:
0.001690574 = sum of:
0.001690574 = product of:
0.005071722 = sum of:
0.005071722 = weight(_text_:s in 184) [ClassicSimilarity], result of:
0.005071722 = score(doc=184,freq=4.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.101928525 = fieldWeight in 184, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=184)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Footnote
- Rez. in: JASIST 53(2002) no.1, S.61-62 (E.G. Ackermann): "This brief summary cannot do justice to the intellectual depth, philosophical richness of the theoretical models, and their implications presented by Leydesdorff in his book. Next to this, the caveats presented earlier in this review are relatively minor. For all that, this book is not an "easy" read, nor is it for the theoretically or philosophically faint of heart. The content is certainly accessible to those with the interest and the stamina to see it through to the end, and would repay those who reread it with further insight and understanding. This book is recommended especially for the reader who is looking for a well-developed, general sociological theory of communication with a strong philosophical basis upon which to build a postmodern, deconstructionist research methodology"
- Pages
- 351 S
-
Leydesdorff, L.; Bensman, S.: Classification and Powerlaws : the logarithmic transformation (2006)
0.00
8.45287E-4 = product of:
0.001690574 = sum of:
0.001690574 = product of:
0.005071722 = sum of:
0.005071722 = weight(_text_:s in 6007) [ClassicSimilarity], result of:
0.005071722 = score(doc=6007,freq=4.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.101928525 = fieldWeight in 6007, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=6007)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 57(2006) no.11, S.1470-1486
-
Leydesdorff, L.; Heimeriks, G.: ¬The self-organization of the European information society : the case of "biotechnology" (2001)
0.00
7.044058E-4 = product of:
0.0014088115 = sum of:
0.0014088115 = product of:
0.0042264345 = sum of:
0.0042264345 = weight(_text_:s in 6524) [ClassicSimilarity], result of:
0.0042264345 = score(doc=6524,freq=4.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.08494043 = fieldWeight in 6524, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=6524)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Footnote
- Vgl. auch die Stellungnahme von P. van den Besselaar: Empirical evidence of self-organization? in: JASIST 54(2003) no.1, S.87-90.
- Source
- Journal of the American Society for Information Science and technology. 52(2001) no.14, S.1262-1274
-
Leydesdorff, L.: Dynamic and evolutionary updates of classificatory schemes in scientific journal structures (2002)
0.00
6.9732615E-4 = product of:
0.0013946523 = sum of:
0.0013946523 = product of:
0.004183957 = sum of:
0.004183957 = weight(_text_:s in 1249) [ClassicSimilarity], result of:
0.004183957 = score(doc=1249,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.08408674 = fieldWeight in 1249, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0546875 = fieldNorm(doc=1249)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and technology. 53(2002) no.12, S.987-994
-
Leydesdorff, L.: Similarity measures, author cocitation Analysis, and information theory (2005)
0.00
6.9732615E-4 = product of:
0.0013946523 = sum of:
0.0013946523 = product of:
0.004183957 = sum of:
0.004183957 = weight(_text_:s in 3471) [ClassicSimilarity], result of:
0.004183957 = score(doc=3471,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.08408674 = fieldWeight in 3471, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0546875 = fieldNorm(doc=3471)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 56(2005) no.7, S.769-772
-
Leydesdorff, L.; Zhou, P.: Co-word analysis using the Chinese character set (2008)
0.00
6.9732615E-4 = product of:
0.0013946523 = sum of:
0.0013946523 = product of:
0.004183957 = sum of:
0.004183957 = weight(_text_:s in 1970) [ClassicSimilarity], result of:
0.004183957 = score(doc=1970,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.08408674 = fieldWeight in 1970, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0546875 = fieldNorm(doc=1970)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 59(2008) no.9, S.1528-1530
-
Leydesdorff, L.: ¬The university-industry knowledge relationship : analyzing patents and the science base of technologies (2004)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 2887) [ClassicSimilarity], result of:
0.0035862487 = score(doc=2887,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 2887, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=2887)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 55(2004) no.11, S.991-1001
-
Leydesdorff, L.: Clusters and maps of science journals based on bi-connected graphs in Journal Citation Reports (2004)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 4427) [ClassicSimilarity], result of:
0.0035862487 = score(doc=4427,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 4427, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=4427)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of documentation. 60(2004) no.4, S.371-427
-
Leydesdorff, L.; Bihui, J.: Mapping the Chinese Science Citation Database in terms of aggregated journal-journal citation relations (2005)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 4813) [ClassicSimilarity], result of:
0.0035862487 = score(doc=4813,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 4813, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=4813)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 56(2005) no.14, S.1469-1479
-
Leydesdorff, L.: Can scientific journals be classified in terms of aggregated journal-journal citation relations using the Journal Citation Reports? (2006)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 5046) [ClassicSimilarity], result of:
0.0035862487 = score(doc=5046,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 5046, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=5046)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 57(2006) no.5, S.601-613
-
Zhou, P.; Leydesdorff, L.: ¬A comparison between the China Scientific and Technical Papers and Citations Database and the Science Citation Index in terms of journal hierarchies and interjournal citation relations (2007)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 70) [ClassicSimilarity], result of:
0.0035862487 = score(doc=70,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 70, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=70)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 58(2007) no.2, S.223-236
-
Leydesdorff, L.: Betweenness centrality as an indicator of the interdisciplinarity of scientific journals (2007)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 453) [ClassicSimilarity], result of:
0.0035862487 = score(doc=453,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 453, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=453)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 58(2007) no.9, S.1303-1319
-
Leydesdorff, L.: On the normalization and visualization of author co-citation data : Salton's Cosine versus the Jaccard index (2008)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 1341) [ClassicSimilarity], result of:
0.0035862487 = score(doc=1341,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 1341, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=1341)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 59(2008) no.1, S.77-85
-
Leydesdorff, L.: Caveats for the use of citation indicators in research and journal evaluations (2008)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 1361) [ClassicSimilarity], result of:
0.0035862487 = score(doc=1361,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 1361, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=1361)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 59(2008) no.2, S.278-287
-
Leydesdorff, L.: Patent classifications as indicators of intellectual organization (2008)
0.00
5.9770816E-4 = product of:
0.0011954163 = sum of:
0.0011954163 = product of:
0.0035862487 = sum of:
0.0035862487 = weight(_text_:s in 2002) [ClassicSimilarity], result of:
0.0035862487 = score(doc=2002,freq=2.0), product of:
0.04975763 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.045765184 = queryNorm
0.072074346 = fieldWeight in 2002, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046875 = fieldNorm(doc=2002)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 59(2008) no.10, S.1582-1597