JCR Bibliometrics Report 2016

American College of Prosthodontists Journal of Prosthodontics

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Contents Impact Factor Metrics and Calculations ...... 2 Journals Citation Ranking (JCR) metrics ...... 2 2016 Impact Factor calculations ...... 2 Journal of Prosthodontics Impact Factor Breakdown ...... 3 Comparison with Peer Journals ...... 3 Journal and peer journal Impact Factor history ...... 4 Citation Trends ...... 5 Citation Distributions ...... 5 Document Types ...... 7 Geographical Analysis ...... 10 Top 20 Institutions by Research Output ...... 13 Cited and Citing Journals ...... 15 Journals Citing Journal of Prosthodontics in 2016 ...... 15 Journals Cited by Journal of Prosthodontics in 2016 ...... 15 Ranked Journals List ...... 16

Glossary ...... 17

Impact Factor Metrics and Calculations

Journals Citation Ranking (JCR) metrics

Data relating to the Journal of Prosthodontics JCR metrics, including Impact Factor, are presented below.

Metric 2014 2015 2016

2Yr Impact Factor 1.071 1.133 1.452 5Yr Impact Factor 1.315 1.356 1.398 2Yr IF Ranking for Dentistry, Oral Surgery & Medicine 56 of 87 55 of 89 45 of 90 Citable Items Published 93 104 100 Immediacy Index 0.129 0.202 0.420 Cited Half Life 6 6.3 6.7 Total Citations to All Journal Content 1383 1484 1685 EigenFactor 0.00293 0.00228 0.0026 Article Influence 0.359 0.303 0.369 2yr IF Cites 211 222 286 5yr IF Cites 676 674 699

2016 Impact Factor calculations

2-Year Impact Factor

2015 = 131 2015 = 104 Cites in 2016 to papers Number of citable 2014 = 155 2014 = 93 published in: items published in: Sum: 286 Sum: 197

Cites to recent papers 286 Calculation: = 1.452 Number of citable items 196

5-Year Impact Factor

2015 = 131 2015 = 104 2014 = 155 2014 = 93 Cites in 2016 to papers 2013 = 93 Number of citable 2013 = 103 published in: 2012 = 154 items published in: 2012 = 94 2011 = 166 2011 = 106 Sum: 699 Sum: 500

Cites to recent papers 699 Calculation: = 1.398 Number of citable items 500

Journal self-cites in 2014-2015

Self Cites 124(7.359% of 1685) Self Cites to Years Used 15(5.245% of 286) in 2016 2-Year Impact Factor Calculation 2-Year 2016 Impact Factor without Self Cites 1.375

Journal of Prosthodontics Impact Factor Breakdown

350 1.6

300 1.4 1.2 Items

250 1 200 Factor

Citable

0.8 150 and

0.6 100 Impact 0.4 Cites

IF 50 0.2 0 0 2012 2013 2014 2015 2016

IF Citations Citable Items Impact Factor

Comparison with Peer Journals

Journal and peer journal rankings

2016 2Yr IF 2Yr IF Journal Subject Impact Rank %Rank Factor Dentistry, Oral 4 of 90 96.60% 4.07 DENTAL MATERIALS Surgery & Medicine Materials Science, 10 of 33 71.80% 4.07 DENTAL MATERIALS Biomaterials JOURNAL OF ORAL Dentistry, Oral 24 of 90 74.10% 2.098 REHABILITATION Surgery & Medicine INTERNATIONAL JOURNAL OF Dentistry, Oral 49 of 90 46.00% 1.386 PROSTHODONTICS Surgery & Medicine INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL Dentistry, Oral 22 of 90 76.40% 2.263 IMPLANTS Surgery & Medicine JOURNAL OF PROSTHODONTICS-IMPLANT 45 of 90 50.50% 1.452 ESTHETIC AND Dentistry, Oral RECONSTRUCTIVE DENTISTRY Surgery & Medicine

Journal and Peer Journal Impact Factor History

4.500

4.000

3.500

3.000

2.500

2.000

1.500

1.000

0.500

0.000 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

DENTAL MATERIALS JOURNAL OF ORAL REHABILITATION INTERNATIONAL JOURNAL OF PROSTHODONTICS INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL IMPLANTS JOURNAL OF PROSTHODONTICS‐IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY

Citation Trends

An Impact Factor is essentially a measure of average citations over a defined period of time (usually two or five years). This can be problematic as averages tend to disguise differences in the behavior of contributing articles. Journals with high Impact Factors may still have a high proportion of uncited content, with the Impact Factor score being reliant on the inclusion of a few highly-cited articles. This can result in Impact Factor fluctuations as the highly-cited articles fall out of the Impact Factor window.

The citation distribution graphs below show the pattern of citation activity within competitor journals for the 2016 Impact Factor period, and within Journal of Prosthodontics since 2011.

Citation Distributions Competitor Journals – 2016 Impact Factor Period

Citation Distibution in Current IF Period (Citable Items Only) 100.00% 90.00% 80.00% 70.00% 60.00% Items

50.00% 40.00% Citable

% 30.00% 20.00% 10.00% 0.00% DENTAL MATERIALS INTERNATIONAL JOURNAL OF INTERNATIONAL JOURNAL OF JOURNAL OF ORAL JOURNAL OF ORAL & MAXILLOFACIAL PROSTHODONTICS REHABILITATION PROSTHODONTICS‐IMPLANT IMPLANTS ESTHETIC AND RECONSTRUCTIVE DENTISTRY

Uncited 1‐3 Cites 4‐7 Cites 8‐12 Cites 13‐20 Cites 21‐40 Cites 41+ Cites

Competitors Top-Cited Papers in 2016 IF Period

Document Publicatio Times Title Journal Author(s) Type n Year Cited 2016 ESTHETIC OUTCOMES FOLLOWING IMMEDIATE INTERNATIONAL AND EARLY IMPLANT JOURNAL OF ORAL Chen, ST Article 2014 28 PLACEMENT IN THE & MAXILLOFACIAL ANTERIOR MAXILLA-A IMPLANTS SYSTEMATIC REVIEW REASONS FOR FAILURES JOURNAL OF ORAL Chrcanovic, Review 2014 27 OF ORAL IMPLANTS REHABILITATION BR CHARACTERIZATION OF A POLYMER-INFILTRATED DENTAL Della Bona, Article 2014 24 CERAMIC-NETWORK MATERIALS A MATERIAL CLINICAL PERFORMANCE OF SCREW-VERSUS INTERNATIONAL CEMENT-RETAINED FIXED JOURNAL OF ORAL Wittneben, Article 2014 24 IMPLANT-SUPPORTED & MAXILLOFACIAL JG RECONSTRUCTIONS-A IMPLANTS SYSTEMATIC REVIEW ENAMEL WEAR CAUSED BY MONOLITHIC ZIRCONIA JOURNAL OF ORAL CROWNS AFTER Stober, T Article 2014 22 REHABILITATION 6MONTHS OF CLINICALUSE BONDING TO OXIDE CERAMICS-LABORATORY DENTAL Kern, M Article 2015 21 TESTING VERSUS MATERIALS CLINICAL OUTCOME THE CLINICAL SUCCESS INTERNATIONAL OF ZIRCONIA-BASED JOURNAL OF Larsson, C Review 2014 21 CROWNS: A SYSTEMATIC PROSTHODONTIC REVIEW S MAKING YTTRIA- DENTAL STABILIZED TETRAGONAL Zhang, Y Article 2014 20 MATERIALS ZIRCONIA TRANSLUCENT IMPROVEMENTS IN IMPLANT DENTISTRY OVER THE LAST DECADE: INTERNATIONAL COMPARISON OF JOURNAL OF ORAL Pjetursson, Article 2014 20 SURVIVAL AND & MAXILLOFACIAL BE COMPLICATION RATES IN IMPLANTS OLDER AND NEWER PUBLICATIONS CONE BEAM COMPUTED TOMOGRAPHY IN IMPLANT DENTISTRY: A INTERNATIONAL SYSTEMATIC REVIEW JOURNAL OF ORAL Bornstein, Article 2014 20 FOCUSING ON & MAXILLOFACIAL MM GUIDELINES, IMPLANTS INDICATIONS, AND RADIATION DOSE RISKS

Citation Distribution – Journal of Prosthodontics Over Time This graph allows us to compare the citation performance of different publication years. In-Window citations refers to those citations that fall within the 2 year Impact Factor window (i.e. for 2014 papers, in-window citations would be those citations received in 2015 and 2016).

Distribution of In‐Window Cites by Publication Year (Citable Items Only) 100.00% 90.00% 80.00% 70.00% 60.00% Items

50.00% 40.00% Citable

% 30.00% 20.00% 10.00% 0.00% 2011 2012 2013 2014

Uncited 1‐3 Cites 4‐7 Cites 8‐12 Cites 13‐20 Cites 21‐40 Cites 41+ Cites

Journal of Prosthodontics Top-Cited Papers in 2016 IF Period

Document Publicati Times Title Journal Author(s) Type on Year Cited 2016 A RETROSPECTIVE JOURNAL OF ANALYSIS OF 800 PROSTHODONTI BRANEMARK SYSTEM CS-IMPLANT Balshi, TJ Article 2014 9 IMPLANTS FOLLOWING THE ESTHETIC AND ALL-ON-FOUR (TM) RECONSTRUCTI PROTOCOL VE DENTISTRY 3D AND 2D MARGINAL FIT OF PRESSED AND CAD/CAM JOURNAL OF LITHIUM DISILICATE PROSTHODONTI CROWNS MADE FROM CS-IMPLANT Anadioti, E Article 2014 8 DIGITAL AND ESTHETIC AND CONVENTIONAL RECONSTRUCTI IMPRESSIONS VE DENTISTRY JOURNAL OF IN VITRO WEAR BEHAVIOR PROSTHODONTI OF ZIRCONIA OPPOSING CS-IMPLANT Passos, SP Article 2014 8 ENAMEL: A SYSTEMATIC ESTHETIC AND REVIEW RECONSTRUCTI VE DENTISTRY SURVIVAL AND COMPLICATION RATES OF JOURNAL OF FIXED RESTORATIONS PROSTHODONTI SUPPORTED BY LOCKING- CS-IMPLANT Mangano, F Article 2014 7 TAPER IMPLANTS: A ESTHETIC AND PROSPECTIVE STUDY WITH RECONSTRUCTI 1 TO 10 YEARS OF FOLLOW- VE DENTISTRY

UP SELECTIVE LASER MELTING TECHNIQUE OF CO-CR DENTAL ALLOYS: A REVIEW JOURNAL OF OF STRUCTURE AND PROSTHODONTI Al Jabbari, Article 2015 6 PROPERTIES AND CS-IMPLANT YS COMPARATIVE ANALYSIS ESTHETIC AND WITH OTHER AVAILABLE RECONSTRUCTI TECHNIQUES VE DENTISTRY JOURNAL OF INFLUENCE OF FULL- PROSTHODONTI CONTOUR ZIRCONIA CS-IMPLANT Bottino, MC Article 2014 5 SURFACE ROUGHNESS ON ESTHETIC AND WEAR OF GLASS-CERAMICS RECONSTRUCTI VE DENTISTRY COMPLICATIONS AND PATIENT-CENTERED OUTCOMES WITH AN JOURNAL OF IMPLANT-SUPPORTED PROSTHODONTI Limmer, B Article 2014 5 MONOLITHIC ZIRCONIA CS-IMPLANT FIXED DENTAL ESTHETIC AND PROSTHESIS: 1 YEAR RECONSTRUCTI RESULTS VE DENTISTRY ASSOCIATION BETWEEN JOURNAL OF ORAL MUCOSAL LESIONS PROSTHODONTI Ercalik- AND HYGIENE HABITS IN A CS-IMPLANT Yalcinkaya, Article 2015 5 POPULATION OF ESTHETIC AND S REMOVABLE PROSTHESIS RECONSTRUCTI WEARERS VE DENTISTRY RANDOMIZED CLINICAL TRIAL OF IMPLANT- JOURNAL OF SUPPORTED CERAMIC- PROSTHODONTI Esquivel- CERAMIC AND METAL- CS-IMPLANT Article 2014 4 Upshaw, JF CERAMIC FIXED DENTAL ESTHETIC AND PROSTHESES: RECONSTRUCTI PRELIMINARY RESULTS VE DENTISTRY INCORPORATION OF JOURNAL OF ANTIMICROBIAL PROSTHODONTI MACROMOLECULES IN CS-IMPLANT Sivakumar, Article 2014 4 ACRYLIC DENTURE BASE ESTHETIC AND I RESINS: A RESEARCH RECONSTRUCTI COMPOSITION AND UPDATE VE DENTISTRY

Document Types

Different article types tend to have different patterns of citation behavior, with review articles traditionally attracting the largest number of citations. As some content (such as Editorials or Meeting Abstracts) traditionally attract few citations, this content does not count towards the Impact Factor denominator. Cites to these articles are therefore known as ‘free citations’ to ‘uncitable items’.

‘Citable items’ in Web of Science are defined as Articles, Proceedings Papers and Reviews. These classifications are based upon the definitions employed by ISI, and are not reliant upon our internal article classifications. Content will generally be classed as ‘citable’ if it contains a significant list of references, an abstract, or if for any other reason ISI judge that it is likely to be well cited.

Competitor Distribution – 2016 Impact Factor Period

% Papers in IF Period 100.00% 90.00% 80.00% 70.00% 60.00% 50.00% Papers

% 40.00% 30.00% 20.00% 10.00% 0.00% DENTAL MATERIALS INTERNATIONAL JOURNAL OF INTERNATIONAL JOURNAL OF JOURNAL OF ORAL JOURNAL OF ORAL & MAXILLOFACIAL PROSTHODONTICS REHABILITATION PROSTHODONTICS‐IMPLANT IMPLANTS ESTHETIC AND RECONSTRUCTIVE DENTISTRY

Article Other Review

Distribution – Journal of Prosthodontics Over Time

% Papers by Publication Year 100.00% 90.00% 80.00% 70.00% 60.00% 50.00% Papers

% 40.00% 30.00% 20.00% 10.00% 0.00% 2011 2012 2013 2014 2015

Article Other Review

Geographical Analysis

The following graphs and tables look at the geographical distribution and citation trends of articles published in competitor journals for the 2016 Impact Factor period, and within Journal of Prosthodontics since 2011. The regions and countries are drawn from the corresponding author only. It should therefore be remembered that some regions may be under-represented – particularly those regions who traditionally nominate an English-speaking collaborator to be known as the corresponding author.

Competitor Regional Distribution – 2016 Impact Factor Period

% Citable Items in IF Period by Region 100.00% 90.00% 80.00% 70.00%

Items 60.00%

50.00% 40.00% Citable

Africa & Middle East Asia Australasia Central & South America Europe North America

Journal of Prosthodontics Regional Distribution Over Time

% Citable Items by Publication Year 100.00% 90.00% 80.00% 70.00% 60.00% Items

50.00% 40.00% Citable

% 30.00% 20.00% 10.00% 0.00% 2011 2012 2013 2014 2015

Africa & Middle East Asia Australasia Central & South America Europe North America

Country Analysis - Competitors

Corresponding Author Distribution - Current IF Period, All Journals, Citable Items Only 250 7.00 6.00 200 5.00 150 4.00

100 3.00 2.00

Citable Items 50 1.00 Avg. Avg. IFCites per Article 0 0.00

Avg. IF Citations No. Citable Items

Country Analysis – Journal of Prosthodontics

Corresponding Author Distribution - Current IF Period, Citable Items Only 160 3.00 140 2.50 120 2.00 100 80 1.50 60 1.00 40

Citable Items 0.50

20 Avg. IF Cites per Article 0 0.00

Avg. IF Citations No. Citable Items

Top 20 Institutions by Research Output

The following institutions produced the most articles published in competitor journals for the 2016 Impact Factor period, and within Journal of Prosthodontics since 2011.

This analysis is conducted based upon author-given affiliations in Web of Science. While ISI has attempted to unify institution names, the matching process is imperfect, and may result in some institutions being under-represented.

Top Institutions – Competitors

No. Citable Average of Times Cited Institute Country Items 2016 OSAKA UNIV JAPAN 23 1.13 SOUTH SEOUL NATL UNIV 17 1.76 KOREA UNIV SAO PAULO BRAZIL 17 0.76 UNIV BERN SWITZERLAND 16 2.06 TOKYO MED & DENT UNIV JAPAN 15 1.40 NYU USA 13 5.00 UNIV MANCHESTER ENGLAND 12 2.50 UNIV ESTADUAL BRAZIL 12 1.50 CAMPINAS UNIV MUNICH GERMANY 11 3.09 UNIV MICHIGAN USA 10 2.30 NIHON UNIV JAPAN 10 0.80 MALMO UNIV SWEDEN 9 6.67 UNIV TURKU FINLAND 9 4.56 UNIV FED PELOTAS BRAZIL 9 3.11 UNIV MARYLAND USA 8 5.38 HARVARD UNIV USA 8 4.38 UNIV KIEL GERMANY 8 4.38 SOUTH YONSEI UNIV 8 2.63 KOREA TOKYO DENT COLL JAPAN 8 0.88 OKAYAMA UNIV JAPAN 8 0.63

Top Institutes – Journal of Prosthodontics

No. Citable Average of 2-year Institute Country Items Cites UNIV ILLINOIS USA 11 1.30 SAO PAULO STATE UNIV BRAZIL 8 1.88 UNIV SAO PAULO BRAZIL 8 1.40 OHIO STATE UNIV USA 7 1.40

GOVT DENT COLL & HOSP INDIA 7 0.86 ISTANBUL UNIV TURKEY 6 1.33 TUFTS UNIV USA 5 2.20 UNIV MANCHESTER ENGLAND 5 2.00 GAZI UNIV TURKEY 5 0.75 UNIV N CAROLINA USA 4 6.25 UNIV FLORIDA USA 4 5.25 UNIV PACIFIC USA 4 4.50 EGE UNIV TURKEY 4 7.00 UNESP UNIV ESTADUAL BRAZIL 4 2.00 PAULISTA CUMHURIYET UNIV TURKEY 4 2.00 UNIV ESTADUAL CAMPINAS BRAZIL 4 1.33 UNIV ESTADUAL PAULISTA BRAZIL 4 2.00 HARVARD UNIV USA 4 0.75 SAUDI KING ABDULAZIZ UNIV 4 0.67 ARABIA ANKARA UNIV TURKEY 4 0.00

Cited and Citing Journals

Journals Citing Journal of Prosthodontics in 2016

These tables show the top journals that cited Journal of Prosthodontics in 2016, ranked in order of number of citations.

This table includes cites received in 2016 to articles published in any volume of Journal of Prosthodontics.

Total Cites Impact Factor Journal (to Articles from All Years) 2.095 J PROSTHET DENT 270 1.452 J PROSTHODONT 124 1.027 J ADV PROSTHODONT 64 2.263 INT J ORAL MAX IMPL 39 4.070 DENT MATER 38 1.073 DENT MATER J 38 2.561 J PROSTHODONT RES 35 3.624 CLIN ORAL IMPLAN RES 35 2.308 CLIN ORAL INVEST 26 1.386 INT J PROSTHODONT 26

Journals Cited by Journal of Prosthodontics in 2016

These tables show the top journals most cited by Journal of Prosthodontics in 2016, ranked in order of number of citation:

Total Cites Impact Factor Journal (to Articles from All Years) 2.095 J PROSTHET DENT 436 2.263 INT J ORAL MAX IMPL 127 4.070 DENT MATER 126 1.452 J PROSTHODNT 124 1.386 INT J PROSTHODONT 119 2.098 J ORAL REHABIL 106 3.624 CLIN ORAL IMPLAN RES 98 4.755 J DENT RES 73 3.456 J DENT 66 2.150 J AM DENT ASSOC 61

Ranked Journals List

Subject Category: Dentistry, Oral Surgery & Medicine 2016 JCR Total Journals in Subject Category: 90

Rank Journal Impact Factor 1 ORAL ONCOLOGY 4.794 2 JOURNAL OF DENTAL RESEARCH 4.755 3 PERIODONTOLOGY 2000 4.072 4 DENTAL MATERIALS 4.070 5 International Journal of Oral Science 3.930 6 CLINICAL ORAL IMPLANTS RESEARCH 3.624 7 European Journal of Oral Implantology 3.567 8 JOURNAL OF CLINICAL PERIODONTOLOGY 3.477 9 JOURNAL OF DENTISTRY 3.456 10 JOURNAL OF PERIODONTOLOGY 3.030 45 Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry 1.452

Glossary

For the purposes of the glossary definitions relate to the 2016 JCR.

5-Year Impact Factor – Citations in the census period (2016) to papers published in the target period (2011-2015), divided by the number of citable items published during the target period (2011-2015). altmetrics - A broad term to describe metrics which, rather than being based on citation counts, are based on alternative measures of interaction with scholarly literature, such as tweets, blog mentions, social bookmarking, etc. For more details see this recent blog posting on Wiley Exchanges: http://exchanges.wiley.com/blog/2015/05/20/article-level-metrics-painting-a-fuller- picture/.

Article Influence – The average influence of a journal's articles over the first five years after publication. It is calculated by dividing a journal’s Eigenfactor Score by the number of articles in the journal, normalized as a fraction of all articles in all publications. This measure is roughly analogous to the 5-Year Journal Impact Factor in that it is a ratio of a journal’s citation influence to the size of the journal’s article contribution over a period of five years.

Citation Index – A database of scholarly content, typically journal articles, where the items are linked by their references allowing a user to navigate through the literature by following reference links. Many citation indices have well-structured bibliographic meta-data, e.g. author names, addresses, keywords, which facilitate searching and analysis.

Cited half-life – The median age of papers in the target period (All years) cited from the census period (2016).

CiteScore CiteScore is a new journal-level metric, joining the ‘basket of metrics’ provided by Elsevier’s Scopus database. It is closely analogous to the Impact Factor, being a simple ratio of citations per article. However, there are a few key differences: 1. CiteScore counts all content indexed in Scopus in the metric denominator. There is no distinction between ‘citable’ and ‘non-citable’ content. However, Scopus does not index meeting abstracts, which tend to be the largest contributor to non-citable item counts in Web of Science. 2. CiteScore operates a 3-year citation window (cites in year x to content in year x-1, x-2 and x-3), bringing it in-line with alternative Scopus metrics such as the Source Normalised Impact per Publication (SNIP) and the Scimago Journal Rank (SJR). In contrast, the Impact Factor operates a 2-year citation window. Practically, this means that CiteScore metric trends may lag one year behind those of the Impact Factor. 3. CiteScore and the Impact Factor are closely correlated for most journals. However, these differences in the metric calculation can affect some titles and publishers more than others. In particular, publishers and journals that publish a lot

17 of editorials / news items / letters (etc) will see an adverse effect, due to these papers now counting in the denominator. For this reason, publishers such as Nature will suffer in CiteScore compared to the Impact Factor. Conversely, publishers with a lot of Social Science / Humanities content will perform well, as the Scopus database has far more extensive coverage of these areas, and therefore a more substantial citation pool. Clarivate Analytics In October 2016, Thomson Reuters finalised the sale of their Intellectual Property and Science business to Onex and Asia Baring. The business (which includes the Web of Science and Journal Citation Reports) has been renamed Clarivate Analytics. We do not anticipate any significant interruption or change of service from this company.

Eigenfactor – The number of weighted citations in the census period (2016), excluding journal self-citations, to papers published within the target period (2011- 2015). Citations are weighted according to the ‘quality’ of the citing journal, citations from higher quality journals are weighted more than citations from lesser journals. The Eigenfactor is most closely related to the Total Citations metric. The mathematics of the calculation are akin to the PageRank calculations that Google uses in its ranking algorithms.

Emerging Sources Citation Index The Emerging Sources Citation Index is a new database within Web of Science, with coverage from 2015 onwards. Its role is to provide visibility into titles that do not (or have not yet) met the stringent criteria for indexing in the three main Web of Sciences databases (the Science Citation Index – Expanded, Social Science Citation Index and Arts & Humanities Citation Index). It also acts as a ‘waiting area’ for journals undergoing evaluation for inclusion in the main indices. In some ways, it can be seen as an attempt by Clarivate Analytics to provide competition to Elsevier’s Scopus database, by expanding its regional and disciplinary parameters. Journals indexed in the ESCI will not receive an Impact Factor in the annual Journal Citation Reports, however citations from ESCI journals will now count towards JCR metric numerators.

GoogleScholar - A citation Index operated by Google. Unlike the paid products Web of Science and Scopus, GoogleScholar is free to use. GoogleScholar covers a broader range of materials than Scopus or Web of Science, including journals, books, thesis, blogs, essentially anything that is deemed to be of academic nature (and some things that are not), but the quality of indexing and analytical functionality is significantly poorer than the paid for products.

GoogleScholar Metrics - Within GoogleScholar several journal level metrics are computed such as the H-index and H-5 Index, the latter being the H-index computed on papers published in the last 5-years only: http://www.google.com/intl/en/scholar/metrics.html#metrics H-index - An article level measure designed to evaluate individual authors, but which can be extended to any set of publication data. The H-index indicates the number of papers, H, that have been cited at least H times, e.g. an H-index of 15 means that 15

18 papers have been cited at least 15 times each. Numerous H-index variants have been proposed.

Immediacy index – Citations in the census period (2016) to papers published in the target period (2016), divided by the number of substantive papers published during the target period (2016).

Impact Factor – Citations in the census period (2016) to papers published in the target period (2014-2015), divided by the number of citable items published during the target period (2014-2015).

Impact Factor Citations –Citation counts in Web of Science data only include instances where it has been possible to match the citation to the cited article. In addition, since October 2013 the Web of Science citation counts have included book citations from the new Book Citation Index. As the Impact Factor includes all citations (including unlinked citations) but does not include book citations, Web of Science data can be used to analyse market share – but is only an indicator for actual Impact Factor deconstruction.

JCR metrics – Only citations from/to journals (plus a small number of book serials and magazines) which are indexed in Web of Science will count towards JCR metrics. The metrics which are produced for the JCR are the Impact Factor, 5-Year Impact Factor, Total Citations, Cited Half-Life, Immediacy Index, Eigenfactor, and Article Influence.

Scopus. A Citation Index operated by Elsevier, available on subscription, and the main paid-for competitor to Thomson Reuters’ Web of Science. Functionality between the two products is largely the same, but Scopus covers approx. 20,000 titles compared to Web of Science’s 12,000. Journal metrics derived from Scopus data include the SNIP (Source Normalised Impact per Publication), and the SJR (SCImago Journal Rank) Indicator.

SJR -The SJR (SCImago Journal Rank) Indicator is a journal metric derived from Scopus data . It operates by weighting the citations a journal receives by the quality of the journal providing these citations. This is broadly similar to how the Eigenfactor and Article Influence work. The mathematics of the calculation are akin to the PageRank calculations that Google uses in its ranking algorithms.

SNIP - The SNIP (Source Normalised Impact per Publication) is a journal metric derived from Scopus data. Its strength is that by normalising citation counts according to the citation potential of a subject, in essence equalising the playing field between subjects where there are differing levels of citation activity, inter subject comparison between journals become possible.

Web of Science - A citation index operated by Thomson Reuters, available on subscription, and the main paid-for competitor to Elsevier’s Scopus. Functionality between the two products is largely the same, but Scopus covers approx. 20,000 titles compared to Web of Science’s 12,000. Journal metrics derived from Thomson Reuters citation date include the Impact Factor, Eigenfactor and Article Influence.