Bibliometric indicators
Number of publications

Scientific publications database
The map presents indicators based on data from the international bibliometrics database Scopus. For the purpose of this study, a specialised dataset from Elsevier was used (data only for Greek publications with additional metadata for the calculation of composite indicators).

Data Processing
EKT has developed its own software which enables data cleaning and integrity check for Scopus databases, calculation of non-trivial bibliometric indicators and presentation of the results using interactive visualizations.

Classification Method
The choropleth map created for visualizing the bibliometric indicators in Greek regions is based on the "Jenks natural breaks" classification algorithm. According to this method, class breaks are identified in order to best group similar values and to maximize the differences between classes. The features (regions) are divided into classes whose boundaries are set where there are relatively big differences in the data values. This is done by minimizing each class’s average deviation from the class mean, while maximizing each class’s deviation from the means of the other groups. This method creates maps that emphasize to the variable’s structure (similarities and differences of the variable’s values).

Types of scientific publications
The calculation of bibliometric indicators was based on articles, research notes and reviews.

Counting of publications
Publication counts are «whole counts» i.e. in the case of multi authored publications each participating institution or country got a whole count and not a fraction of the publication. Similarly, in the case of a publication classified in more than one scientific field, each scientific field or sub-field got a whole count of the publication.

The regions in red belong to the same data cluster.

Press info to find out more regarding the spatial analysis and methodology used for the choropleth map development.