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bundles / scipy 1.18.0 / scipy / stats / _probability_distribution / _ProbabilityDistribution / variance

function

scipy.stats._probability_distribution:_ProbabilityDistribution.variance

source: /scipy/stats/_probability_distribution.py:661

Signature

def variance(self, *, method)

Summary

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.

Examples

Instantiate a distribution with the desired parameters: 
from scipy import stats
X = stats.Normal(mu=1., sigma=2.)
✓
Evaluate the variance: 
X.variance()
X.variance() == X.moment(order=2, kind='central') == X.sigma**2
✗
np.True_

See also

mean
moment
standard_deviation

Aliases

  • scipy.stats._distribution_infrastructure._ProbabilityDistribution.variance