What do the different bibliometric indicators mean?

Bibliometric indicators are calculated for each publication individually. Indicators for an individual researcher will be shown when this person logs in to the Karolinska Institutet bibliometric database. An analysis based on field normalized indicators for an individual researcher with less than 50 publications cannot be ordered by someone else.

List of indicators available through the bibliometric system. (For a full list of bibliometric indicators and explanations to how they are calculated, see Bibliometric handbook.) 

  • P: Number of publications identified with the current analyzed set of publications.
  • At KI/SLL: Number of verified publications with a recognizable KI address (including university hospitals). Verified means that the publications in the Karolinska Institutet bibliometric database have both been identified by the researcher in question and that an organizational affiliation has been supplied by him/herself.
  • C: Total number of citations
    The Total number of citations is the sum of citations (self citations included) from all publications present in the database to all verified publications for the analyzed set of publications.
  • c: Number of citations to a single publication
  • cf:: Field Normalized Citation Score for a single publication
    The Item Oriented Field Normalized Citation Score normalizes the number of citations to a single verified publication by comparing it to the mean number of citations to documents of the same type, published the same year, in the same research area.
  • Avg Cf: Field Normalized Citation Score Average
    The average Field Normalized Citation Score is calculated on The Item Oriented Field Normalized Citation Score for all verified publications for the current analyzed set of publications. The world average is about 1, and an indicator of for example 1.2 means that the analyzed group of articles is cited 20% above the world average. (At present the standard method of using the ISI Journal Classifications to identify the research area is being used.)
  • Sum Cf: Total Field Normalized Citation Score
    The sum of all the item oriented field normalized citation scores for all verified publications for the active selection.
  • Pf5%: Field Normalized Top Publications
    The indicator Field Normalized Top Publications shows the number of verified publications for the active selection that belong to the 5% most cited publications in the world. The normalization is made by comparing the number of citations to each verified publication to the 95th percentile of citation distruibution to all publications from the same year, in the same subject and of the same document type. (At present the standard method of using the ISI Journal Classifications to identify the research area is being used).
  • Share Pf5%: Field Normalized Share of Top Publications
    The indicator Field Normalized Share of Top Publications shows the percentage of verified publications for the current analyzed set of publications that belong to the 5% most cited publications in the world. The normalization is made by comparing the number of citations to each verified publication to the 95th percentile of the average citations to all publications from the same year, in the same subject and of the same document type. (At present the standard method of using the ISI Journal Classifications to identify the research area is being used).
  • JIF: ISI Journal Impact Factor
    The ISI Journal Impact Factor is a measure of the frequency with which the "average article" in a journal has been cited in a particular year. The ISI impact factor for a specific journal, one specific year (Y), is calculated by counting the number of citations to articles in that journal the two preceding years (Y-1 and Y-2) from publications in year Y and dividing this with the number of publications.
  • ∑ JIF: Sum of ISI Journal Impact Factors
    The sum of the ISI Journal Impact Factors connected to each verified article or review in the active selection.
  • Avg JIF: Average of ISI Journal Impact Factors
    The average of the ISI Journal Impact Factors connected to each verified article or review in the active selection.

Note!

No field normalized indicators are calculated for

  • too recent publications (with a publication year equal to the present year or last year)
  • publications belonging to fields with fewer than 30 publications per year
  • publications belonging to fields with an average citation rate lower than 0,2 cites.
  • for a subset of publications less than 50 publications

Moreover, the compiled indicators are only based on publications with document type "Article" or "Review". This is to ensure statistical stability.

In the verification toolkit each verified publication with a not too recent publication year (see note above) also displays the value of the "Item Oriented Field Normalized Citation Score" for that individual publication, and will if it is one of the 5% most highly cited publications from that year in its field show a text indicating this.

Senast uppdaterad: 
2019-04-09