I'm testing the sphericity assumption for a Repeated Measures ANOVA with time as the independent variable (baseline; 1 week; 10 weeks):

Baseline, Week 1 and Week 10 are entered as RM Factor 1 and transferred to Repeated Measures Cells. Sphericity tests ticked under Assumption Checks but it returns "The repeated measures has only two levels. The assumption of sphericity is always met when the repeated measures has only two levels."

Can anyone help? I would have thought that Baseline, Week 1 and Week 10 gives three levels? File is attached.

Thanks,

Cait