A Cosine Cutoff Value

I recently discovered this but cannot remember where. The article was relating to ultra-sounds and mapping them although I was surprised that fuzzy c-means was not mentioned. I have deployed it with some decent effect in text mining algorithms I am writing.

threshold = sqrt((1/matrix.shape[0])*Sum(xij – column_meanj))

 

Please comment if you have found something better or know where this came from. Cheers!

 

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