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JMPBeginer
JMPBeginer
New Member

Tukey HSD test and p value

5 hours ago (90 views)

I have two groups of data that I want to compare via the Tukey test. Graphical representation of the groups shows pairs as overlapping circles while ordered differences report p value is <0.05.  how can this difference explained? 

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2 REPLIES 2
MRB3855
Super User MRB3855
Super User

Re: Tukey HSD test and p value

5 hours ago (77 views)  |  Posted in reply to message from JMPBeginer 10-16-2024

Hi @JMPBeginer , and welcome. This phenomena can happen if the degree of overlap is not "enough": See link below.

Comparison Circles (jmp.com)

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dlehman1
dlehman1
Level V

Re: Tukey HSD test and p value

2 hours ago (51 views)  |  Posted in reply to message from MRB3855 10-16-2024

This was something I discovered several years ago - I also thought the overlapping circles would have meant p>.05.  The correct explanation using the tangent lines and angles I find to be the rare JMP display that is not helpful.  The Tukey HSD analysis provides plenty of ways to explore which differences are significant and the circles are the least useful (in my opinion).