• Its basic task: the quantitative examination of the organization and operation of science
• Quantitative indicators are needed to measure scientific performance
• Basis of indicators: scientific publications – the source of research results and related data, their place of publication
• Prerequisite: available data
• Scientific metrics are indicators based on statistics, their value is strongly discipline-dependent, therefore
  • There is no single number to measure scientific performance
  • There is no single way to measure scientific performance
  • There is no single source of data to measure scientific performance
  • Only numbers from the same field of study should be compared. The forms and habits of disciplines, communicating and publishing of disciplines can be very different from each other.

Metrics related to journals

• Impact Factor (IF)
  Impact factor / quotient measuring the quality of journals, which ranks scientific journals based on citations. It is published every year by Thomson Reuters.
  Calculation: number of citations to articles published in the previous two years in a given year divided by the number of articles published in that year
  Available: Journal Citation Report (JCR)

• SCImago Journal Rank (SJR)
  List of specialist journals.
  References from higher-rated journals are given more weight.
  The journals are also given a prestige rating based on the specialization: D is the top 10% (deciles) Q1: best 25%; Q2: 25-50%; Q3: 50-75%; Q4: 75-100% (quartile classification)
  A journal can belong to several disciplines.
  Calculation: citations are calculated based on the previous 3 years.
  Available: Scimago Journal & Country Rank

Metrics for authors

• Types of references:
  • Self-citation: the author refers to his own article.
  • Dependent citation: the author refers to an article for which he was a co-author.
  • Independent reference: there is no match between the referenced and referring author(s).
• Hirsch-index (H-index)
  It is mainly used to determine individual performance. It also takes into account the number of publications and citations.
  Calculation: If a researcher has an H-index of 5, it means that he or she has a total of 5 publication that were cited at least 5 times each; the other publications of his or her are less than this.
  Available: Google Scholar, Web of Science, Scopus, MTMT