Scopus Google Scholar Web of knowledge Too much

Scopus, Google Scholar, Web of knowledge: Too much or not too much? ICOLC Autumn 2005 7 th European Meeting - Poznan, Poland Ezio Tarantino Con la collaborazione con Mary Joan Crowley BIDS – Biblioteca digitale della Sapienza University of Rome “La Sapienza” 1

University of Rome “La Sapienza” • 1999: BIDS (digital library) is born (10 databases) • 2001: Web of Science 2

University of Rome “La Sapienza” Usage statistics (2002) 3

University of Rome “La Sapienza” Usage statistics (2002) 4

University of Rome “La Sapienza” Usage statistics (2002) 5

University of Rome “La Sapienza” Usage statistics (2002) 6

University of Rome “La Sapienza” 2003 WOS 7

University of Rome “La Sapienza” How many times has that my article • • How article been cited? 8

University of Rome “La Sapienza” 2004, July Scopus trial. Pre-release version 9

University of Rome “La Sapienza” 2004, October Coverage & overlap * source: CSA 10

University of Rome “La Sapienza” 2004, November Start-up of Google Scholar 2005, January Signed contract with SCOPUS 11

A quantitative evaluation How many articles? How many citations? 12

A quantitative evaluation Number of articles WOS: Scopus: Google Scholar 35. 000 articles 25. 000 ? 13

A quantitative evaluation Time range WOS: Scopus: Google Scholar 1990 -2003 1996? 14

A quantitative evaluation The test 10 articles per discipline (economics, medicine, science, psychology) from international journal, since 1968 until 2003. 15

A quantitative evaluation The test Number of positive answers 16

A quantitative evaluation 17

A quantitative evaluation The test Number of citations 18

A quantitative evaluation 19

A quantitative evaluation The test Number of citations by discipline 20

A quantitative evaluation 21

A quantitative evaluation The test Average citations per article found 22

A quantitative evaluation 23

A quantitative evaluation The test Articles by time range 24

A quantitative evaluation The test Articles found by year 25

A qualitative evaluation Test #1 Discipline: Psychology Article: Hoffmann, L. W. , The Influence of the Family Environment on Personality: Accounting for Sibling Differences, di Hoffman (Psychological Bulletin, 1991) citations: Scopus: WOS: GS: 51 (3 not found elsewhere) 81 (35 not found elsewhere) 33 (4 not found elsewhere) 26

A qualitative evaluation citations: Scopus: WOS: GS: 51 (3 unique) 81 (35 unique) 33 (4 unique) citations in common WOS-Scopus: WOS-GS: Scopus-GS: 43/51 25/33 26/33 27

A qualitative evaluation citations: Scopus: WOS: GS: 51 (3 unique) 81 (35 unique) 33 (4 unique) citations in common WOS+Scopus: (81+51)-43 = 89 WOS+GS: (81+33)-25 = 89 Scopus+GS: (51+33)-26 = 58 28

A qualitative evaluation QUESTIONS Advantage or disadvantage? Is it “noise” or more information? Who decides? 29

A qualitative evaluation 30

A qualitative evaluation Test #2 Discipline: Economics and finance Article: Frittelli. M. : The minimal Entropy Martingale Measure and the Valuation Problem in Incomplete Markets, (Mathematical finance, 2000) citations: Scopus: WOS: GS: 36 32 116 31

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Epstein, L. , and S. Zin, 1989, "Substitution, Risk Aversion, and the Temporal Behavior of Consumption and Asset Returns: A Theoretical Framework, " Econometrica, 57, 937– 969. [ISI] Epstein, L. , and S. Zin, 1991, "Substitution, Risk Aversion, and the Temporal Behavior of Consumption and Asset Returns: An Empirical Investigation, " Journal of Political Economy, 99, 263– 286. [Cross. Ref][ISI] article [Frittelli, The minimal Entropy Martingale Measure and the Valuation Problem in Incomplete Markets, ] should be here Gilboa, I. , and D. Schmeidler, 1989, "Maxmin Expected Utility with Non-unique Prior, " Journal of Mathematical Economics, 18, 141– 153. [Cross. Ref][ISI] Hansen, L. , and T. Sargent, 1995, "Discounted Linear Exponential Quadratic Gaussian Control, " IEEE Transactions on Automatic Control, 40, 968– 971. [Cross. Ref][ISI] 33

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Fritelli, [F 00] M. Fritelli, (2000), The minimal entropy martingale measure and the valuation problem in incomplete markets. Mathematical Finance, Vol. 10, pp. 39{52 35

A qualitative evaluation Test #3 Article: Buncel, E. . : Rationalizing the regioselectivity in polynitroarene anionic σ-adduct formation. Relevance to nucleophilic aromatic substitution (Chemical Reviews 1995 (7), pp. X-2280 ) citations: Scopus: WOS: GS: 3 65 15 36

A qualitative evaluation 37

A qualitative evaluation 38

A qualitative evaluation 39

A qualitative evaluation Test #4 (The ghost article: an international plot) Article: Ryckaert-Ciccotti: Numerical integration of the cartesian equations of motion of a system with constraints: molecular dynamics of n-alkanes. Journal of computation physics, 1977) citations: Scopus: WOS: GS: not found cited by 1. 276 40

A qualitative evaluation 41

A qualitative evaluation 42

A qualitative evaluation 43

Conclusion The winner is…. No winner! 44

Thank you ezio. tarantino@uniroma 1. it 45