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This code requires Python, igraph, Networkx, and numpy.

It is a function that can be used to calculate the leadership insularity of a graph in the GML format. It can be run from the command-line as well:

python leaderIns.py graph.gml

If used, please cite the following paper:

Arbesman, S, and N. Christakis. Leadership Insularity: A New Measure of Connectivity Between Central Nodes in Networks. Connections 30:1. 

The code is license under GPL. And of course, no guarantee is made of the code.

-Sam Arbesman