> For what I understand the node-level indexes should be the betweenness 
> calculated for each node? Is that right?
Yes and no. Yes, they are the node-level betweenness scores, but no in your 
case, because your graph is weighted but centralization.betweenness does not 
handle weights (yet), as far as I know.

> Also, what if I just want to get the $centralization using the centralization 
> formula as an output? I need to write just that value to compare multiple 
> networks.
Well, then simply use centralization.betweenness(centrg, 
directed=TRUE)$centralization and store that ;)

-- 
T.


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