bundles / scipy latest / scipy / stats / _probability_distribution / _ProbabilityDistribution / standard_deviation

function

`scipy.stats._probability_distribution:_ProbabilityDistribution.standard_deviation`

source: /scipy/stats/_probability_distribution.py :578

Signature

def standard_deviation ( self , * , method )

Summary

Standard deviation (square root of the second central 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 standard deviation:

X.standard_deviation()
X.standard_deviation() == X.moment(order=2, kind='central')**0.5 == X.sigma

✗

See also

mean
moment
variance

Aliases

scipy.stats._distribution_infrastructure._ProbabilityDistribution.standard_deviation