return critical values for Tukey’s HSD (Q)
k : int in {2, ..., 10}
number of tests
df : int
degrees of freedom of error term
alpha : {0.05, 0.01}
type 1 error, 1-confidence level
not enough error checking for limitations :
sm.sandbox.stats.multicomp.ecdf
sm.sandbox.stats.multicomp.homogeneous_subsets
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