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. Author manuscript; available in PMC: 2013 May 8.
Published in final edited form as: Methods Inf Med. 2010 Nov 18;49(6):581–591. doi: 10.3414/ME09-01-0083

Figure 1.

Figure 1

A sample patient-symptom bipartite network (a) showing patients as black nodes, and symptoms as white nodes. The size of a node represents the number of edges that are connected to it. Therefore the Fatigue node in the center is large because many patients have that symptom. Bipartite networks can be reduced to analyze how symptoms co-occur using a method called a one-mode projection (b). Here the nodes represent symptoms, and the edges represent one or more times that the connected symptoms co-occur in a patient.