Welcome!

Sign in with your CogSci, Facebook, Google, or Twitter account.

Or register to create a new account.

We'll use your information only for signing in to this forum.

Supported by

Sphericity

PierrePierre Posts: 2
edited July 18 in JASP & BayesFactor

Hello,
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.

Regards.

Comments

  • cescocesco Posts: 26

    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.

    Thanked by 2EJ sebastiaan
  • EJEJ Posts: 368

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

  • PierrePierre Posts: 2

    Thanks for this very clear answer.

Sign In or Register to comment.