calculate all pairwise comparisons with TukeyHSD confidence intervals
this is just a wrapper around tukeyhsd method of MultiComparison
Parameters : | endog : ndarray, float, 1d
groups : ndarray, 1d
alpha : float
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Returns : | results : TukeyHSDResults instance
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See also
MultiComparison, tukeyhsd, statsmodels.sandbox.stats.multicomp.TukeyHSDResults