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    • Raymond Hettinger's avatar
      bpo-36018: Add properties for mean and stdev (GH-12022) · 9e456bc7
      Raymond Hettinger yazdı
      
      Responding to suggestions on the tracker and some off-line suggestions.
      
      Davin suggested that english named accessors instead of greek letters would result in more intelligible user code. Steven suggested that the parameters still need to be *mu* and *theta* which are used elsewhere (and I noted those parameter names are used in linked-to resources). 
      
      Michael suggested proving-out the API by seeing whether it generalized to *Lognormal*.  I did so and found that Lognormal distribution parameters *mu* and *sigma*  do not represent the mean and standard deviation of the lognormal distribution (instead, they are for the underlying regular normal distribution).
      
      Putting these ideas together, we have NormalDist parameterized by *mu* and *sigma* but offering English named properties for accessors.  That gives lets us match other API that access mu and sigma, it matches the external resources on the topic, gives us clear english names in user code. The API extends nicely to LogNormal where the parameters and the summary statistic accessors are not the same.
      
      
      https://bugs.python.org/issue36018
      9e456bc7
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