Dr. habibzade

Journal Impact Factorand H-indexFarrokh Habibzadeh, MD,Secretary, World Association of Medical Editors (WAME)Editorial Consultant, The LancetVice President, Eastern Mediterranean Association of Medical Editors (EMAME)Director, NIOC Medical Education and Research Center, Shiraz, Iran1Scientometrics2Scientometrics (Definition)Scientometrics is the science of measuring and analyzing science.

It is often done through bibliometrics.

3ScientometricsFirst citation analysis by Gross & Gross (1927)Journal to journal cross-citation (Cason & Lubotsky, 1936)Journal Impact Factor (IF) by Eugene Garfield (1955)

4Journal Impact Factor5Journal Impact FactorDefinition:IF: IF of journal in 2008P: number of substantive articles published in 2006-07C: number of citations made in year 2008 to articles published in 2006-07Garfield E. JAMA; 295(1); 90-3

6Example

7Top Journals in General/Internal Medicine

8Journal Impact FactorIs calculated and sold by Thomson-Reuter (formerly Thomson Scientific, before that, the Institute of Scientific Information [ISI])No one has independently audited the validity of the data*In many centers, affectsDecision on where to publishWhom to promote or hireSuccess of grant applicationsWinning prizeEven salary bonuses*Rossner M, van Epps H, Hills E. J Exp Med 2007;204:3052-3

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10Journal Impact FactorProsA measure for journal qualityEasy to calculate

ConsSubstantive articles?May be used unwiselydrawing conclusions about individual performance is not the proper way to interpret impact factor.*Calculations behind the wallSubject to manipulation

*http://scientific.thomsonreuters.com/citationimpactforum/8424440/ Rossner M, van Epps H, Hills E. J Exp Med 2007;204:3052-3. Marusic A, et al. Science and Engineering Ethics 2008;14:41-9.11H-index12H-indexA scientist has index h, if h of his/her Np papers have at least h citations each, and the other (Np h) papers have no more than h citations each.

Hirsch JE. Proc Nat Acad Sci 2005;102:1656972.

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PaperNumber of CitationsExample14

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17H-indexProsTwo-dimensional

ConsWho?Different databases!Contribution through one or two influential papersNikolai Korotkoff Wilhelm Conrad RntgenSubject to manipulationSelf-citationMember of a prolific research group

4618Alternatives19Journal Network

20Weighted Impact FactorCounting a reference from a more prestigious journal more heavilyKochen, 1974Pinski & Narin, 1976PageRank of GoogleY-factor (Bollen, et al, 2006)SCImago SJR (www.scimagojr.com, 2007)Prestige: the standing or estimation in the eyes of other people/journals (Merriam-Webster Dictionary)21

22Journal Impact FactorDefinition:IF: IF of journal in 2006P: number of substantive articles published in 2004-05C: number of citations made in year 2006 to articles published in 2004-05Garfield E. JAMA; 295(1); 90-3

23Weighted Impact Factor

24Calculation of WeightsPopularity of the cited journalPrestige of the citing relative to the cited journal25Calculation of Weights

PYIF: Previous year IF q w[0, +) [0.1, 10)1126How Journals Are CitedIF WIF1.346 2.703

1.333 3.723

14.780 7.410

23.175 8.869

51.296 14.472

13.750 14.47527Parameters of 70 Medical JournalsRankAbbreviated Journal TitleArticles Published in 2004-05Total Cites Received in 2006Year 2006IFWIFIFWIF12NEW ENGL J MED 62432,00951.29614.47224LANCET 77620,02125.8009.07835JAMA-J AM MED ASSOC 67415,62023.1758.86946ANN INTERN MED 3645,38014.7807.41051PLOS MED 1081,48513.75014.47563ANNU REV MED 5978113.23710.593710BRIT MED J 9108,4139.2455.9341532ANN FAM MED 1425403.8033.803298AMYLOID 671281.9106.7633967J AM BOARD FAM MED 1372081.5181.5184250SWISS MED WKLY 1912571.3462.7034333J TRAVEL MED 1381841.3333.7236770DM-DIS MON 47350.7450.7297069CAN FAM PHYSICIAN 117820.7011.2222829Other MetricsImmediacy IndexEigenfactor score Article Influence scorePer article citation influence

Carl Bergstrom

Jevin West

Ben Althouse

Martin Rosvall

Ted Bergstrom30Top Journals in General/Internal Medicine

31None of these metrics are adequate compared with what should be the gold standardPeer Review32F1000 Medicine

http://f1000medicine.com33

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Read the Articles; Dont Count Them35