Closeness centrality measure not working?

Question

Hello, I have a diagram with some 250 nodes inteconnected by 550 edges (no self-loops) and I want to perform a closeness centrality measuring (interpretation of edge directionality/name disabled). However, the measuring results always to all nodes getting the value 0.00. The other centrality measures work without a problem (except the "graph centrality" which gets the same result as closeness centrality) - they provide a proper value with corresponding size/colour readjustment. Does anyone know of a solution?

Thanks!

Answer 1

Most likely, your graph is not connected. Closeness is defined as the multiplicative inverse (1/x) of the sum of the distances of the given node to all other nodes. If the graph is not connected, the distance is considered to be infinity, resulting in a centrality value of 0.0. The problem with Graph centrality is the same since it is defined as the maximum of the distances of the given node to all other nodes.

To detect the connect components of your graph, you can use the Auto Grouping feature.

Answer 2

Right you were, there was one node that lacked connection. Now it works, thank you very much!