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Degree Distribution




Its use originates from the study of Random Graph by Paul Erdős and Alfréd Rényi Erdos, P. and Renyi, A., 1959, Publ. Math. (Debrecen) 6, 290., and it has become an important concept which describes the topology of complex networks.

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DEFINITION



Degree


The Degree Of A Node (or Connectivity ) is, k, tells how many links (or edges) the node has to other nodes.

In directed networks nodes has two types of degrees. The incoming
degree ''k''in denotes the number of links that point to a node,
and an outgoing degree ''k''out denotes the number of links that
start from it. An undirected network with ''N'' nodes and '''''L''''' links is
characterized by an average degree = 2L/N (where <> denotes
the average)A.-L. Barabási and Z. N. Oltvai, Nature Reviews Genetics 5, 101-113 (2004).


Degree distribution


The degree distribution, P(k), is a function describing the total number of Vertices in a graph with a given Degree (number of connections to other vertices).

Formally, the degree distribution is