Cluster transitivity

The cluster transitivity (the fraction of closed triangles ) of g is equal to:

C =(number of triangles) × 3/(number of connected triples)

Formula (7.28) Networks Mark Newman (2018)

I would like to ask you about the method cluster_transitivity() It gives 0.0853107962707866 for this network: http://snap.stanford.edu/data/email-E... , but a table from this page shows that Fraction of closed triangles is 0.03015. So, these two number are not equal.

If I omit 3 in the formula (7.28) and I get 0.0284369320902622.

Why?

On this page: http://snap.stanford.edu/data/index.html (at the end), we have a definition of the fraction of closed triangles: Number of connected triples of nodes / number of (undirected) length 2 paths

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The method cluster_transitivity is simply
import networkx

so may be you should ask the developers of networkx the difference with the method implemented and used by SNAP ?`