Relational data represent relationships between entities anywhere on the web (e.g. online social networks) or in the physical world (e.g. structure of the protein).
When it comes to Social Network Analysis (SNA) a common practice is to use centrality measures such as Betweenness (Bridgeness), Closeness and Degree. For instance, we often represent “Hubness” (in-degree) by colour scale, and “Bridgeness” (betwee
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