Hi AFNI crew,
I am trying to implement an analysis in 3dLME and I would like some guidance setting up the model and random effects, and nesting.
With limited numbers of subjects, we run multiple sessions / subject. I want to nest session within subject.
I want to assess the interaction between Taste and Hydration.
I have:
5 sessions (the random effect)
3 subjects
taste: 3 levels
hydration: 2 levels
The lines I've drafted are as follows:
-model 'Subj*Taste*Hydration' \
-num_glt 5 \
-gltLabel 1 'pre-post' -gltCode 1 'Hydration : 1*pre -1*post' \
-gltLabel 2 'water_pre-post' -gltCode 2 'Hydration : 1*pre -1*post Taste : 1*H2O' \
-gltLabel 3 'sucrose_pre-post' -gltCode 3 'Hydration : 1*pre -1*post Taste : 1*Sucr' \
-gltLabel 4 'citricacid_pre-post' -gltCode 4 'Hydration : 1*pre -1*post Taste : 1*CitA' \
-gltLabel 5 'Taste_by_Hydration' -gltCode 5 'Taste : 1*H2O -1*Sucr & 1*H2O -1*CitA Hydration : 1*pre & 1*post' \
-ranEff '~1+Subj|Ssn' \
-SS_type 3 \
-dataTable
Ssn Subj Taste Hydration InputFile
1) Does the column order matter? Should the random effect be in the first column?
2) Is the correct model: 'Subj*Taste*Hydration' ?
3) Is this how to write the random effects with nesting: -ranEff '~1+Subj|Ssn' ?
Thanks!
Peter
