Hello, everyone. I have no idea about how to calculate the simple size if I used repeated- measures ANOVA with time (PRE vs POST) as the within-subject factor and group (young vs olderly) as the between-subjects factor. Am I going to use ANOVA:Repeated measures, within-between interaction? And I am not sure the number of measurements, is it four?
Li Keke attached: https://www.youtube.com/watch?v=tFmTlEoqy8I
Good luck
I think you are right, using the ANOVA: ANOVA:Repeated measures, within-between interaction. But I would chose 2 measurements instead of 4, as you will only make two measurements (before and after).
You may watch this short video/tutorial from Youtube : https://www.youtube.com/watch?v=T820ySBAlvQ
Li Keke attached: https://www.youtube.com/watch?v=tFmTlEoqy8I
Good luck
I'd also go for 2 measurements, as it's a pre-post kind of treatment.
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