I am trying to understand how Gephi/NodeXL measures Betweeness and Closeness Centrality or rather why there is a difference in measurement.
A twitter network with 1004 nodes and 2314 edges was sent to me. I measured centrality both in Gephi and NodeXL (directed network). Unfortunately I got two different results:
Gephi:
Betweenness  Closeness
A: 358.0  1.0
B: 0.0  0.0
C: 0.0  0.0
NodeXL:
Betweenness  Closeness
A: 295472,785  0,001
B: 91827,372  0,000
C: 92674,065  0,000
At first I thought the network caused the strange results so I tried to measure the statistics using other networks. It turns out that the network was not the problem. Can anyone explain to me how this is possible?
