3dMVM Error

AFNI Message Board
1

Dear AFNI experts,

I was trying to run 3dMVM for 2 between subject variables (genotype and group) and 1 within subject variable (Time) with the below 3dMVM command based on AFNI 3dMVM instruction example 2, but kept getting the error message saying ‘Failed at GLT No. 1! Make sure that the model or GLT specification syntax is correct’. Could you please let me know what would be the problem here?

3dMVM -prefix genotype_by_group_Time -jobs 1
-bsVars "genotypegroup"
-wsVars ‘Time’
-num_glt 1
-gltLabel 1 ‘genotype_by_group_Time’ -gltCode 1 'genotype : 1C -1NC group : 1A -1B Time : 1post -1*pre’
-mask GMmask+tlrc
-dataTable
Subj genotype group Time InputFile
Subj1 N A pre Subj1dataset_pre+tlrc
Subj1 N A post Subj1dataset_post+tlrc
Subj2 C B pre Subj2dataset_pre+tlrc
Subj2 C B post Subj2dataset_post+tlrc
.
.

Best,
JW

2

-gltLabel 1 ‘genotype_by_group_Time’ -gltCode 1 ‘genotype : 1C -1NC group : 1A -1B Time : 1post -1pre’ \

Should this part “1C -1NC” be “1C -1N”?

3

Hi Gang,

Thanks and sorry it was a silly question. Can I have one more question about the result? I found a greater activation in right inferior frontal gyrus after running this, but am not sure how to interpret this. Could you please advise how to interpret the interaction between genotype x group x time results?

Best,
Jun

4

Could you please advise how to interpret the interaction between genotype x group x time results?

Try adding a few more inferences that help you tease apart the three-way interaction:

-gltCode ? ‘genotype : 1C -1N group : 1A -1B Time : 1post’
-gltCode ? 'genotype : 1C -1N group : 1A -1B Time : 1pre’
-gltCode ? ‘genotype : 1C -1N group : 1A Time : 1post’
-gltCode ? ‘genotype : 1C -1N group : 1A Time : 1pre’
-gltCode ? ‘genotype : 1C -1N group : 1B Time : 1post’
-gltCode ? ‘genotype : 1C -1N group : 1B Time : 1pre’
-gltCode ? ‘genotype : 1C group : 1A Time : 1post’
-gltCode ? 'genotype : 1C group : 1A Time : 1pre’
-gltCode ? ‘genotype : 1C group : 1B Time : 1post’
-gltCode ? 'genotype : 1C group : 1B Time : 1pre’
-gltCode ? ‘genotype : 1N group : 1A Time : 1post’
-gltCode ? 'genotype : 1N group : 1A Time : 1pre’
-gltCode ? ‘genotype : 1N group : 1B Time : 1post’
-gltCode ? 'genotype : 1N group : 1B Time : 1pre’ \