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I am working on an algorithm for community detection on complex systems, where those systems are modeled as graphs. To form community i need to find similarity between nodes.

I am using Jaccard similarity. Normally the similarity value is between 0 and 1. However to detect community, i need to determine a certain threshold value.

My question is:

How can I define an appropriate threshold value? There is some methods to do that? If not, what is the best threshold value that I can use it to find similar nodes?

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