How probability distribution of each feature is calculated ?

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Andrew Paul McKenzie Pegman

You can do it visually. They both seem to be identical except for for a few points in the middle :)

Ette Etuk

The empirical definition of probability is a relative frequency. It is easy to plot the probabilities of the sample points using the relative frequency approach. Your plots in SPS.png are obtained by the same approach. There is nothing difficult to understand there.

Abhay Pratap Singh

You can make rough estimate by simply using Histogram approach