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Hi Jeanette,

Ah....this is actually a continuous question of my previous post "2x2x2 repeated measures ANOVA model."

Just like we discussed, presumably at the first level the order of the 8 EVs is:
A1B1C1
A1B1C2
A1B2C1
A1B2C2
A2B1C1
A2B1C2
A2B2C1
A2B2C2

The 3-way interaction in my first-level model would be:
ABC            =[1 -1 -1  1  -1 1 1  -1]

I just want to know the group mean of this 3-way interaction. 

By setting up a group mean 1s model in my higher level analysis, should I just check the t (zstat) map which is exactly the group mean of this 3-way interaction?

Thanks in advance.

Mark

2013/2/4 Jeanette Mumford <[log in to unmask]>
Hi,

The tricky thing with an f-contrast is that there isn't a single mean as you are testing a group of contrasts simultaneously in a "are any of these significant?" test.  In FSL you cannot bring lower level f-contrasts to the higher level, but will work with single contrasts instead.  

Hope that helps,
Jeanette


On Mon, Feb 4, 2013 at 8:18 AM, Mark <[log in to unmask]> wrote:
Hi,

Sorry this might be a simple question but I just don't know how.....

In my first-level feat model, I have a F contrast as well as many t contrast. I want to see the group mean of the F contrast. However, when I set up a group mean contrast using 1s in the higher-level model, I can only see the group average of t contrasts.

How can I see group mean of F contrast?

Thanks.

Mark