Returns the confidence interval for the variance.
Parameters : | lower_bound : float
upper_bound : float
sig : float
|
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Returns : | Interval : tuple
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Notes
If the function returns the error f(a) and f(b) must have different signs, consider lowering lower_bound and raising upper_bound.
Examples
>>> random_numbers = np.random.standard_normal(100)
>>> el_analysis = sm.emplike.DescStat(random_numbers)
>>> el_analysis.ci_var()
>>> 'f(a) and f(b) must have different signs'
>>> el_analysis.ci_var(.5, 2)