AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

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The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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March 05, 2023 04:12PM
Hello!
I am running a script with 3dMVM command for group-level analysis between 2 groups (CT, KI). I have 3 between-subject variables (Group, Sex, Age) and 1 within-subject variable (Scan).

I was expecting the output for group difference from F-test and t-test would come out the same as there 2 groups, but the output came different. After clusterization with 6 voxels at p<0.05, there are 11 clusters for F-test and 10 for the t-test (attached picture). My question is why the F-test and t-test came different?

Code:
3dMVM -prefix MVM_emx_baseline_splitBLOCK_E_Cov_AgenSex.nii -jobs 28 \
-bsVars 'Group*Sex+Group*Age' \
-wsVars 'Scan' \
-qVars 'Age' \
-num_glt 3 \
-gltLabel 1 CT-KI -gltCode 1 'Group : 1*CT -1*KI' \
-gltLabel 2 Group_by_Scan -gltCode 2 'Group : 1*CT -1*KI Scan : 1*th1 -1*th2' \
-gltLabel 3 th1-th2 -gltCode 3 'Scan : 1*th1 -1*th2' \
Attachments:
open | download - F-test.jpg (769.6 KB)
open | download - t-test.jpg (818.4 KB)
Subject Author Posted

3dMVM F test and t test output Attachments

Adury March 05, 2023 04:12PM

Re: 3dMVM F test and t test output

gang March 06, 2023 11:58AM

Re: 3dMVM F test and t test output

ptaylor March 06, 2023 01:17PM

Re: 3dMVM F test and t test output Attachments

Adury March 07, 2023 10:12AM

Re: 3dMVM F test and t test output Attachments

Adury March 07, 2023 10:14AM

Re: 3dMVM F test and t test output Attachments

Adury March 07, 2023 10:18AM

Re: 3dMVM F test and t test output

ptaylor March 07, 2023 03:44PM

Re: 3dMVM F test and t test output Attachments

Adury March 08, 2023 09:19AM

Re: 3dMVM F test and t test output

Adury March 08, 2023 01:30PM

Re: 3dMVM F test and t test output

ptaylor March 08, 2023 04:24PM

Re: 3dMVM F test and t test output

Adury March 08, 2023 09:51PM

Re: 3dMVM F test and t test output

ptaylor March 09, 2023 01:14PM

Re: 3dMVM F test and t test output Attachments

Adury March 21, 2023 10:27PM

Re: 3dMVM F test and t test output

ptaylor March 22, 2023 06:47PM

Re: 3dMVM F test and t test output

ptaylor March 23, 2023 06:18AM

Re: 3dMVM F test and t test output

Adury March 24, 2023 11:11AM