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

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

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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June 18, 2022 03:34PM
Hello,

I would like to verify my interpretation for the paired 3dttest++ output when I include a covariate.

For subbricks that include a covariate (e.g., sub-brick 2 and 3 in the example below) do these show clusters representing differences between SetA and SetB while holding covariate IQ constant? OR would you interpret the significant clusters as differences between SetA and SetB for different levels of IQ (i.e., SetA and SetB vary as a function of IQ)?

Thank you very much,
Tam


STRUCTURE OF THE OUTPUT DATASET ~1~
-------------------------------

#0 SetA-SetB_mean = difference of means [covariates removed]
#1 SetA-SetB_Tstat
#2 SetA-SetB_IQ = difference of slopes wrt covariate IQ
#3 SetA-SetB_IQ_Tstat
#4 SetA_mean = mean of SetA [covariates removed]
#5 SetA_Tstat
#6 SetA_IQ = slope of SetA wrt covariate IQ
#7 SetA_IQ_Tstat
#8 SetB_mean = mean of SetB [covariates removed]
#9 SetB_Tstat
#10 SetB_IQ = slope of SetB wrt covariate IQ
#11 SetB_IQ_Tstat
Subject Author Posted

Interpreting Covariate in 3dttest++

tamtam June 18, 2022 03:34PM

Re: Interpreting Covariate in 3dttest++

rick reynolds June 21, 2022 11:26AM

Re: Interpreting Covariate in 3dttest++

rick reynolds June 22, 2022 01:58PM