scipy.stats.Normal.

standard_deviation

Normal.standard_deviation(*, method=None)

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.

See also

variance

mean

moment

References

[1]

Standard deviation, Wikipedia, https://en.wikipedia.org/wiki/Standard_deviation#Definition_of_population_values

Examples

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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()
2.0
>>> X.standard_deviation() == X.moment(order=2, kind='central')**0.5 == X.sigma
True

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