Returns the confidence interval of the value, effect of the constraint.
This is currently only available for t and z tests.
alpha : float, optional
The significance level for the confidence interval. ie., The default alpha = .05 returns a 95% confidence interval.
ci : ndarray, (k_constraints, 2)
The array has the lower and the upper limit of the confidence interval in the columns.
statsmodels.stats.contrast.ContrastResults.summary_frame
statsmodels.stats.contrast.ContrastResults.summary
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