I'm trying to compare several sets of experiment data, by comparing means. I read there are several different tests such as *Each Pair, Student’s t* and *All Pairs, Tukey HSD*, which give different circles of different radius, an example shown below

How are the circles defined? How do I calculate the radius? And is there a rule what test one should use for what kind of data?

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#### Best Answer

There is a discussion of the circle construction in the JMP help/manuals. See Statistical Details for Comparison Circles.