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edited July 2017 in JASP & BayesFactor

In Assumption checks for the test of sphericity with AnovaRM with two levels, an annotation indicates "When the repeated measure has only two levels, the assumption of sphéricity is always met". Have you any references, please?

Thanks in advance.



  • The assumption of sphericity is met when the variances of the differences are equal. With two levels, you only have one difference (level 1 - level 2) with nothing left to compare this difference with. Hence thusly, your data is inherently spherical.

  • Thanks for responding, Cesco -- I somehow missed this question

  • Thanks for this very clear answer.

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