-
Egghe, L.; Rousseau, R.: Averaging and globalising quotients of informetric and scientometric data (1996)
0.02
0.0205279 = product of:
0.0410558 = sum of:
0.0410558 = sum of:
0.003609657 = weight(_text_:s in 7659) [ClassicSimilarity], result of:
0.003609657 = score(doc=7659,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.072074346 = fieldWeight in 7659, 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=7659)
0.03744614 = weight(_text_:22 in 7659) [ClassicSimilarity], result of:
0.03744614 = score(doc=7659,freq=2.0), product of:
0.16130796 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046063907 = 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)
0.5 = coord(1/2)
- Source
- Journal of information science. 22(1996) no.3, S.165-170
-
Egghe, L.: Little science, big science and beyond (1994)
0.00
0.0021056333 = product of:
0.0042112665 = sum of:
0.0042112665 = product of:
0.008422533 = sum of:
0.008422533 = weight(_text_:s in 6883) [ClassicSimilarity], result of:
0.008422533 = score(doc=6883,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.16817348 = fieldWeight in 6883, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.109375 = fieldNorm(doc=6883)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Scientometrics. 30(1994) nos.2/3, S.389-392
-
Egghe, L.: Expansion of the field of informetrics : the second special issue (2006)
0.00
0.0018048285 = product of:
0.003609657 = sum of:
0.003609657 = product of:
0.007219314 = sum of:
0.007219314 = weight(_text_:s in 7119) [ClassicSimilarity], result of:
0.007219314 = score(doc=7119,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.14414869 = fieldWeight in 7119, 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=7119)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Information processing and management. 42(2006) no.6, S.1405-1407
-
Egghe, L.: Expansion of the field of informetrics : origins and consequences (2005)
0.00
0.0018048285 = product of:
0.003609657 = sum of:
0.003609657 = product of:
0.007219314 = sum of:
0.007219314 = weight(_text_:s in 1910) [ClassicSimilarity], result of:
0.007219314 = score(doc=1910,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.14414869 = fieldWeight in 1910, 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=1910)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Information processing and management. 41(2005) no.6, S.1311-1316
-
Egghe, L.: Special features of the author - publication relationship and a new explanation of Lotka's law based on convolution theory (1994)
0.00
0.0018048285 = product of:
0.003609657 = sum of:
0.003609657 = product of:
0.007219314 = sum of:
0.007219314 = weight(_text_:s in 5068) [ClassicSimilarity], result of:
0.007219314 = score(doc=5068,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.14414869 = fieldWeight in 5068, 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=5068)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science. 45(1994) no.6, S.422-427
-
Egghe, L.: Note on a possible decomposition of the h-Index (2013)
0.00
0.0018048285 = product of:
0.003609657 = sum of:
0.003609657 = product of:
0.007219314 = sum of:
0.007219314 = weight(_text_:s in 683) [ClassicSimilarity], result of:
0.007219314 = score(doc=683,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.14414869 = fieldWeight in 683, 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=683)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 64(2013) no.4, S.871
-
Egghe, L.: ¬The Hirsch index and related impact measures (2010)
0.00
0.0018048285 = product of:
0.003609657 = sum of:
0.003609657 = product of:
0.007219314 = sum of:
0.007219314 = weight(_text_:s in 1597) [ClassicSimilarity], result of:
0.007219314 = score(doc=1597,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.14414869 = fieldWeight in 1597, 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=1597)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Annual review of information science and technology. 44(2010) no.1, S.65-114
-
Egghe, L.: Informetric explanation of some Leiden Ranking graphs (2014)
0.00
0.0017016088 = product of:
0.0034032175 = sum of:
0.0034032175 = product of:
0.006806435 = sum of:
0.006806435 = weight(_text_:s in 1236) [ClassicSimilarity], result of:
0.006806435 = score(doc=1236,freq=4.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.1359047 = fieldWeight in 1236, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=1236)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- The S-shaped functional relation between the mean citation score and the proportion of top 10% publications for the 500 Leiden Ranking universities is explained using results of the shifted Lotka function. Also the concave or convex relation between the proportion of top 100?% publications, for different fractions ?, is explained using the obtained new informetric model.
- Source
- Journal of the Association for Information Science and Technology. 65(2014) no.4, S.737-741
-
Egghe, L.: ¬A good normalized impact and concentration measure (2014)
0.00
0.0015040238 = product of:
0.0030080476 = sum of:
0.0030080476 = product of:
0.006016095 = sum of:
0.006016095 = weight(_text_:s in 1508) [ClassicSimilarity], result of:
0.006016095 = score(doc=1508,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.120123915 = fieldWeight in 1508, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.078125 = fieldNorm(doc=1508)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the Association for Information Science and Technology. 65(2014) no.10, S.2052-2054
-
Egghe, L.; Rousseau, R.; Rousseau, S.: TOP-curves (2007)
0.00
0.0014889077 = product of:
0.0029778155 = sum of:
0.0029778155 = product of:
0.005955631 = sum of:
0.005955631 = weight(_text_:s in 50) [ClassicSimilarity], result of:
0.005955631 = score(doc=50,freq=4.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.118916616 = fieldWeight in 50, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0546875 = fieldNorm(doc=50)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 58(2007) no.6, S.777-785
-
Egghe, L.: ¬A rationale for the Hirsch-index rank-order distribution and a comparison with the impact factor rank-order distribution (2009)
0.00
0.0014889077 = product of:
0.0029778155 = sum of:
0.0029778155 = product of:
0.005955631 = sum of:
0.005955631 = weight(_text_:s in 3124) [ClassicSimilarity], result of:
0.005955631 = score(doc=3124,freq=4.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.118916616 = fieldWeight in 3124, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0546875 = fieldNorm(doc=3124)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- We present a rationale for the Hirsch-index rank-order distribution and prove that it is a power law (hence a straight line in the log-log scale). This is confirmed by experimental data of Pyykkö and by data produced in this article on 206 mathematics journals. This distribution is of a completely different nature than the impact factor (IF) rank-order distribution which (as proved in a previous article) is S-shaped. This is also confirmed by our example. Only in the log-log scale of the h-index distribution do we notice a concave deviation of the straight line for higher ranks. This phenomenon is discussed.
- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.10, S.2142-2144
-
Egghe, L.; Ravichandra Rao, I.K.: ¬The influence of the broadness of a query of a topic on its h-index : models and examples of the h-index of n-grams (2008)
0.00
0.001302523 = product of:
0.002605046 = sum of:
0.002605046 = product of:
0.005210092 = sum of:
0.005210092 = weight(_text_:s in 2009) [ClassicSimilarity], result of:
0.005210092 = score(doc=2009,freq=6.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.10403037 = fieldWeight in 2009, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0390625 = fieldNorm(doc=2009)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- The article studies the influence of the query formulation of a topic on its h-index. In order to generate pure random sets of documents, we used N-grams (N variable) to measure this influence: strings of zeros, truncated at the end. The used databases are WoS and Scopus. The formula h=T**1/alpha, proved in Egghe and Rousseau (2006) where T is the number of retrieved documents and is Lotka's exponent, is confirmed being a concavely increasing function of T. We also give a formula for the relation between h and N the length of the N-gram: h=D10**(-N/alpha) where D is a constant, a convexly decreasing function, which is found in our experiments. Nonlinear regression on h=T**1/alpha gives an estimation of , which can then be used to estimate the h-index of the entire database (Web of Science [WoS] and Scopus): h=S**1/alpha, , where S is the total number of documents in the database.
- Source
- Journal of the American Society for Information Science and Technology. 59(2008) no.10, S.1688-1693
-
Egghe, L.; Guns, R.; Rousseau, R.: Thoughts on uncitedness : Nobel laureates and Fields medalists as case studies (2011)
0.00
0.0012762066 = product of:
0.0025524131 = sum of:
0.0025524131 = product of:
0.0051048263 = sum of:
0.0051048263 = weight(_text_:s in 4994) [ClassicSimilarity], result of:
0.0051048263 = score(doc=4994,freq=4.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.101928525 = fieldWeight in 4994, 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=4994)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Footnote
- Vgl.: Erratum. In: Journal of the American Society for Information Science and Technology. 63(2012) no.2, S.429.
- Source
- Journal of the American Society for Information Science and Technology. 62(2011) no.8, S.1637-1644
-
Egghe, L.; Rousseau, R.: Duality in information retrieval and the hypegeometric distribution (1997)
0.00
0.001203219 = product of:
0.002406438 = sum of:
0.002406438 = product of:
0.004812876 = sum of:
0.004812876 = weight(_text_:s in 647) [ClassicSimilarity], result of:
0.004812876 = score(doc=647,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.09609913 = fieldWeight in 647, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=647)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of documentation. 53(1997) no.5, S.499-496
-
Egghe, L.: On the law of Zipf-Mandelbrot for multi-word phrases (1999)
0.00
0.001203219 = product of:
0.002406438 = sum of:
0.002406438 = product of:
0.004812876 = sum of:
0.004812876 = weight(_text_:s in 3058) [ClassicSimilarity], result of:
0.004812876 = score(doc=3058,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.09609913 = fieldWeight in 3058, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=3058)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science. 50(1999) no.3, S.233-241
-
Egghe, L.; Rousseau, R.: ¬The influence of publication delays on the observed aging distribution of scientific literature (2000)
0.00
0.001203219 = product of:
0.002406438 = sum of:
0.002406438 = product of:
0.004812876 = sum of:
0.004812876 = weight(_text_:s in 4385) [ClassicSimilarity], result of:
0.004812876 = score(doc=4385,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.09609913 = fieldWeight in 4385, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=4385)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science. 51(2000) no.2, S.158-165
-
Egghe, L.: Mathematical theories of citation (1998)
0.00
0.001203219 = product of:
0.002406438 = sum of:
0.002406438 = product of:
0.004812876 = sum of:
0.004812876 = weight(_text_:s in 5125) [ClassicSimilarity], result of:
0.004812876 = score(doc=5125,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.09609913 = fieldWeight in 5125, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=5125)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Scientometrics. 43(1998) no.1, S.57-62
-
Egghe, L.; Liang, L.; Rousseau, R.: ¬A relation between h-index and impact factor in the power-law model (2009)
0.00
0.001203219 = product of:
0.002406438 = sum of:
0.002406438 = product of:
0.004812876 = sum of:
0.004812876 = weight(_text_:s in 6759) [ClassicSimilarity], result of:
0.004812876 = score(doc=6759,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.09609913 = fieldWeight in 6759, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=6759)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.11, S.2362-2365
-
Egghe, L.: Dynamic h-index : the Hirsch index in function of time (2007)
0.00
0.001203219 = product of:
0.002406438 = sum of:
0.002406438 = product of:
0.004812876 = sum of:
0.004812876 = weight(_text_:s in 147) [ClassicSimilarity], result of:
0.004812876 = score(doc=147,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.09609913 = fieldWeight in 147, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.0625 = fieldNorm(doc=147)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 58(2007) no.3, S.452-454
-
Egghe, L.: Sampling and concentration values of incomplete bibliographies (2002)
0.00
0.0010528166 = product of:
0.0021056333 = sum of:
0.0021056333 = product of:
0.0042112665 = sum of:
0.0042112665 = weight(_text_:s in 450) [ClassicSimilarity], result of:
0.0042112665 = score(doc=450,freq=2.0), product of:
0.05008241 = queryWeight, product of:
1.0872376 = idf(docFreq=40523, maxDocs=44218)
0.046063907 = queryNorm
0.08408674 = fieldWeight in 450, 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=450)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and technology. 53(2002) no.4, S.271-281