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2015-03-30 10:39:01 +0200 | asked a question | How to use DiscreteRandomVariable covariance method? I'd like to take advantage of covariance() method of DiscreteRandomVariable class, yet, I can't find any example on the internet how to properly use it. My understanding is that this should work: However, I receive unexpected ValueError: But... Logically (not technically) both text1freq and text2freq are the same probability space: |