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How to interpret the results from "multcompare" function?

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A N on 17 Oct 2018
Commented: A N on 19 Oct 2018
Hi, I used "multcompare" function in Matlab and I am not sure how to interpret the results. The graph of group means comparison gives me sometimes different results than the p value in output "c". For example: the group comparison intervals intersect (it means that groups do not differ) and the p value for this pair is lower than alpha= 0,05 (it means that groups differ). Do you have any experience with that? Thanks.

Accepted Answer

Jeff Miller
Jeff Miller on 17 Oct 2018
This article might help. The key point is this: "A frequently encountered misconception is that if 2 independent 95% CIs overlap each other, as they do in Fig. 1, then a statistical test of the difference will not be statistically significant at the 5% level."

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