> I am actually using the z values sub-brick to threshold, and then the sub-brick before as overlay. Is that what you mean?

Yes, this is usually preferable.

> we found that values of -0.07 (for example) are very hard to grasp on their own.

Depending on the context, that value may have some physical meaning and is interpretable, unlike statistical value (which is dimensionless).

> do you know any reference that mentions the differences between the chi-square sub-brick and the one that includes
> directions and explains why it is possible to take either either one as a source for group x time interactions?

These two statistical values are computed from two different perspectives. The first one with chi-square is considered an omnibus test: it's usually computed as F-statistics under the conventional AOVA; in 3dLMEr it's assessed with chi-square. An omnibus statistics is usually formulated across two or more effects. The second one (Z-statistic) is assessed as a contrast between two groups: this is a special case for the omnibus test between two effects. These two are equivalent simply because there are only two groups in your case. If you had three groups, you would not have this equivalence situation.

Gang



Edited 1 time(s). Last edit at 08/25/2022 07:11AM by Gang.