Gephi/NodeXL - measurement difference (betweenness/closeness)
<p>I am trying to understand how Gephi/NodeXL measures Betweeness and Closeness Centrality or rather why there is a difference in measurement. </p>

<p>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:</p>

<blockquote>
  <p><strong>Gephi:</strong></p>
  
  <p><em>Betweenness | Closeness</em></p>
  
  <p>A: 358.0 | 1.0</p>
  
  <p>B: 0.0 | 0.0</p>
  
  <p>C: 0.0 | 0.0</p>
</blockquote>

<p></p>

<blockquote>
  <p><strong>NodeXL:</strong></p>
  
  <p><em>Betweenness | Closeness</em></p>
  
  <p>A: 295472,785 | 0,001</p>
  
  <p>B: 91827,372 | 0,000</p>
  
  <p>C: 92674,065 | 0,000</p>
</blockquote>

<p>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?  </p>