Thanks so much! That is very helpful.

I saw in a different post that 3dLME will run the main effects and interactions, but the user has to specify all of the follow-up tests. Does that include looking at direct comparisons of the main effects? For instance, would the following follow-ups via glt be appropriate if I wanted to know look at all of the main effects and interactions with and without trauma severity (PCL5; see script below)?

Also, I am a little confused about glf. The description in the help page of glfCode makes it seem like it is typically used for testing the main effects and interaction -but isn't that what 3dLME is already doing?

Please let me know if you have any questions. Thanks again for your time.

3dLME -prefix unc_cl_test
-jobs 1
-model "Valence*Predict*PCL5+Age+Sex"
-qVars "Age,PCL5"
-ranEff '~1+Age'
-SS_type 3
-num_glt 14
-gltLabel 1 'neg-neu' -gltCode 1 'Valence : 1*neg - 1*neu'
-gltLabel 2 'u-p' -gltCode 2 'Predict : 1*u - 1*p'
-gltLabel 3 'Uneg-Uneu' -gltCode 3 'Valence : 1*neg - 1*neu Predict : 1*u'
-gltLabel 4 'Pneg-Pneu' -gltCode 4 'Valence : 1*neg - 1*neu Predict : 1*p'
-gltLabel 5 'Uneg-Pneg' -gltCode 5 'Predict : 1*u - 1*p Valence : 1*neg'
-gltLabel 6 'Uneu-Pneu' -gltCode 6 'Predict : 1*u - 1*p Valence : 1*neu'
-gltLabel 7 'Uneg-Pneu' -gltCode 7 'Predict : 1*u - 1*p Valence : 1*neg - 1*neu'
-gltLabel 8 'neg-neu_PCL5' -gltCode 1 'Valence : 1*neg - 1*neu PCL5 :'
-gltLabel 9 'u-p_PCL5' -gltCode 2 'Predict : 1*u - 1*p PCL5 :'
-gltLabel 10 'Uneg-Uneu_PCL5' -gltCode 3 'Valence : 1*neg - 1*neu Predict : 1*u PCL5 :'
-gltLabel 11 'Pneg-Pneu_PCL5' -gltCode 4 'Valence : 1*neg - 1*neu Predict : 1*p PCL5 :'
-gltLabel 12 'Uneg-Pneg_PCL5' -gltCode 5 'Predict : 1*u - 1*p Valence : 1*neg PCL5 :'
-gltLabel 13 'Uneu-Pneu_PCL5' -gltCode 6 'Predict : 1*u - 1*p Valence : 1*neu PCL5 :'
-gltLabel 14 'Uneg-Pneu_PCL5' -gltCode 7 'Predict : 1*u - 1*p Valence : 1*neg - 1*neu PCL5 :'
-dataTable
Subj Valence Predict Age Sex PCL5 InputFile