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scipy.stats.Mixture.

# variance

Mixture.variance(*, method=None)

  Variance (central second moment)

  Parameters:
    method{None, ‘formula’, ‘transform’, ‘normalize’, ‘quadrature’, ‘cache’}

      Method used to calculate the central second moment. Not all methods are available for all distributions. See `moment` for details.

  See also

  `moment`
  `standard_deviation`
  `mean`

  References

  [1]

  Variance, Wikipedia, https://en.wikipedia.org/wiki/Variance#Absolutely_continuous_random_variable

  Examples

  Instantiate a distribution with the desired parameters:

      >>> from scipy import stats
      >>> X = stats.Normal(mu=1., sigma=2.)

  Evaluate the variance:

      >>> X.variance()
      4.0
      >>> X.variance() == X.moment(order=2, kind='central') == X.sigma**2
      True