About Metrics

ORBilu collects to depict a variety of quantitative data for mapping the Institution's scientific production and outreach used for evaluation and interpretation for continued support of our scholarly research activities.


The data is collected annually since 2012 and analysed for informational and evaluation purposes by the University to understand scholarly research behaviour, e.g. the research trends and strengths, project funding, our collaborations and authorship, the type of research output generated and their dissemination and impact, uptake into practice, and our efforts towards Open Science, in terms of increase in Open Access publications.

It is important to use them in combination, taking into account the context and associating them with a qualitative assessment, as recommended by international initiatives like DORA (San Francisco Declaration on Research Assessment) and the Leiden Manifesto.

Some of the indicators we are specifically interested in:


Statistics of views and downloads via ORBilu 
  • Number of views of the reference via ORBilu. The data between parentheses represents the number of vizualisations internally within the University of Luxembourg.
  • Number of downloads  via ORBilu, including the requests copy. The data between parentheses represents the number of downloads internally within the University of Luxembourg.
  • Detailed usage data by country, by origin of ORBilu's visitors (referer).
Citations of the publication

The number of citations measures the number of times a document has been cited by other scientific publications, within a given corpus and over a given period of time. This number, therefore, differs depending on the databases (Web of Science, Scopus, Google Scholar, etc.), which do not have the same scope.

In ORBilu  we offer citations from different databases :

Altmetrics data

These are alternative measures aimed mainly at highlighting the use of scientific publications on the Internet, using, among other things, shares on social networks (Twitter (X) and LinkedIn), downloads on platforms such as Mendeley and mentions in blogs or wikis.

Indicators linked to the journal
  • Citescore (Scopus): ratio between the number of citations received by all the articles of the journal and the number of articles published by this journal. It is calculated for a 3-year publication period.
  • SJR (SCImago Journal Rank): measures the impact of a journal by taking into account the prestige of the citing journals (itself calculated on the basis of the number of citations they have received). It is the average number of citations of the journal's articles in the 3 years following its publication, each citation being weighted by the importance of the citing journal. It includes, to a limited extent, a journal's self-citations.
  • SNIP (Source Normalized Impact per Paper): measures the impact of a journal in its field. It relates the number of citations per paper in the journal to the total number of citations in the journal's field. 
Indicators linked to the author or to a group of publications
  • h-index or Hirsch Index

This index attempts to measure both the scientific productivity and the apparent scientific impact of a scientist. According to Hirsh: "A scientist has index "h" if h of his/her papers have at least h citations each, and the other papers have no more than h citations each."

In ORBilu, the "h" index is based on the number of citations of the references listed in the report. For each citations provider (Scopus, OpenCitation etc.) there is a corresponding h-index. The h-index appears in the bibliometric synthesis of the publications report. 



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