# I have a question about Two Way ANOVA repeated measures

#### dextery

##### New Member
Hello,

The authors compare 2 groups: one experimental and one control.
The difference is a robot-therapy for the experimental and physical therapy for the control.

There are 3 measures of time: T0 = Baseline / T1 = After 15 sessions and T2 after 30 sessions.

The authors say they use a two way repeated measures ANOVA.
And then in post-hoc a Wilcoxon signed rank.

Can you help me to understand:
Why is it a 2x2 repeated mesures ANOVA ?
Is there a between-subjects comparison?

Thank you.

#### Karabiner

##### TS Contributor
Why is it a 2x2 repeated measurements ANOVA
2 groups and 2 repeated measurements (t0-t1; t2-t1) in each analysis.

With kind regards

Karabiner

#### dextery

##### New Member
Thank you Karabiner.

Can you confirm me that there is a between-subjects comparaison (2 groups) and a within-subjects comparison (2 repeated measurements)?

I also see 2 groups:
Control group: 27 and Experimental group: 26.

Is it sufficient for ANOVA ?
Because, I believed that he needs 30 participants per group for ANOVA.

#### Karabiner

##### TS Contributor
Can you confirm me that there is a between-subjects comparaison (2 groups) and a within-subjects comparison (2 repeated measurements)?
No, I cannot confirm that.
Because, I believed that he needs 30 participants per group for ANOVA.
I never heard about such a rule.

With kind regards

Karabiner