History of AFNI updates  

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November 20, 2014 05:52PM
Sarah,

Yes you can use 3dttest++ for the analysis with age as a covariate. The program will automatically outputs each group's age effect, the group difference in age effect, each group's average connectivity, and the group difference in connectivity. One caveat is that, if you're interested in each group's average connectivity and the group difference in connectivity, you need to properly center the age values. If the groups have roughly the same average age, then it's pretty straightforward; however, if the average age significantly differs between the groups, you have to be careful about the centering for the age values. Regarding this plus interpreting the output sub-bricks, read the help information in

3dttest++ -help | less

Gang



Edited 1 time(s). Last edit at 11/25/2014 12:28PM by Gang.
Subject Author Posted

Age x Gender Interaction 3dttest++

S November 20, 2014 01:13PM

Re: Age x Gender Interaction 3dttest++

gang November 20, 2014 05:52PM

Re: Age x Gender Interaction 3dttest++

S November 25, 2014 12:09PM

Re: Age x Gender Interaction 3dttest++

S January 20, 2015 01:39PM

Re: Age x Gender Interaction 3dttest++

gang January 20, 2015 02:40PM