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Thread Subject:
Repeated measures factorial ANOVA

Subject: Repeated measures factorial ANOVA

From: Aino

Date: 15 Aug, 2010 17:42:03

Message: 1 of 2

Hi all!

I am trying to do a repeated measures factorial ANOVA. The independent factors are EO/EC (two conditions) and Pre/Post (before and after treatment, this is the difference I am really interested in), i.e. I have a 2x2 matrix (EO+Pre, EO+Post, EC+Pre and EC+Post). The subjects are the same at all the groups and the groups are (therefore) the same size. Since I have a lot of measures (dependent variables) I have to repeat this so many times that would be nice to do it with Matlab..

I found many different ANOVAs in Matlab, but how to do this one?

One reason I find this a bit challenging is that there seems to be different names for different ANOVAs. Is 2x2 factorial ANOVA the same as two-way ANOVA? If this is the case, is there a way to do a _repeated_ measures two-way ANOVA? The examples I found only have groups that are different.

Also using this repeated measures factorial/two-way ANOVA, is there a way to see which change is statistically more significant Pre->Post when EO or Pre->Post when EC or will I have to do say a paired Student's t-test to get this? And if I do just a lot of t-tests (which always sound a bit iffy to me..), is there any reason to do the factorial ANOVA?
  
Thank You,
Aino

Subject: Repeated measures factorial ANOVA

From: Aino

Date: 14 Jul, 2011 15:06:28

Message: 2 of 2

A year has passed and I'm struggling again with the same problem. So I'll answer myself. I found this link:

http://www.mathworks.com/matlabcentral/fileexchange/6874-two-way-repeated-measures-anova

Isn't this what I'm looking for? Matlab still doesn't have a build in 2x2 repeated measures ANOVA, or does it?

Thank you,
Aino

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