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TIBCO Spotfire DecisionSite 9.1.1 Statistics - User's Manual
If the circles for different groups do not overlap (or that the external angle of intersection is less
than 90 degrees) the means of the two groups are generally significantly different. If the circles
have a large overlap, the means are not significantly different.
The explanation to why the overlap defines whether group means are significant or not can be
deduced to the Pythagorean Theorem.
Comparison circles
Mathematical
expression
Interpretation
The groups are
significantly different.
Borderline
significantly different.
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