code: def kurt(self):
          
          mn = self.mean
          sd = self.std
          kt = 0.0 if abs(sd) <= 1e-8 else np.mean((self._mcpts - mn) ** 4) / sd ** 4
          return kt
docs: Kurtosis coefficient value as a result of an uncertainty calculation,
          defined as::
              
                        m4
              beta2 = ------
                      std**4
  
          where m4 is the fourth central moment and std is the standard deviation