Hello Alfonso,

Thank you for your quick response previously.

I've encountered another doubt about contrasts in my work and would like to obtain some clarification on it.

As previously mentioned, I have two groups: Patients and Control, as well as two subgroups, Group A and Group B.

I would like to see interaction between Group A and B.

i.e. In terms of SET theory, they are known as intersection and union (conjunction and union) between group A and B.

According to earlier posts, I may perform conjunction between two groups by utilizing “any effects” between the two groups and exporting the findings to SPM and performing a normal conjunction analysis, and I hope this is the correct method to accomplish it?

My question is, how can I perform the union operation between Group A and B ?


Thank you in advance.

Regards,
Abhishek