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Aha, it seems that even people want to do such 2nd level analysis, they are not able to do that. At least people need two runs to conduct the 2nd level analysis. 

I should admit that I am still a beginner with FSL.  I ever thought people can do that, but the results would be the same - If anything, the data format or tags perhaps will change after 2nd level analysis. 

Inline image 1

Any good pointers for me to jump to 3rd level analysis directly on this issue?




On Mon, Dec 19, 2016 at 6:51 PM, Sim Luck <[log in to unmask]> wrote:
Hi, List experts,

I have two naive questions.

1. After I finish the first level analysis of FEAT, can I directly jump to the third level analysis? For instance, if in an experiment, each subject only has one run which I am interested in.  That is to say, I only consider that run, no other runs.  Any advice for me? I assume that the answer is yes, but hope to confirm with you experts.

2. In the Full Model setup ("Contrasts & F-tests"), if I want to compare "group1+group2+group3" and group 4, can I input as (1, 1, 1 -3) as following? Note, we can not input 1/3 to the GUI of FEAT there.

EV1    EV2     EV3      EV4
1.0       1.0      1.0        -3.0

According to my understanding, this should be fine, as 1+1+1-3 = 0. Please experts help to confirm my thoughts. 

Thank you very much,
Sim Luck