Network graphs

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Network graphs are used to rapresent data based on the concept of “linked” items: data are intrinsically structured with relationships of connection.

In network graphs, data items are represented with nodes, connections are represented with edges.

Network-graph.jpg

Graph edges can be directed or undirected. The degree of a node is the number of links connected to it (In-degree and out-degree for directed graphs). Graph edges can have values (weights) on them. These values can be nominal, ordinal or quantitative.