Sorry for the delay ...
1. FS cannot do hierarchical regression. Can you elaborate on the sum of squares types? Or point me to a web page/
2. DODS will account for all 2 way interactions between discrete and continuous variables. If you want other interactions, you'll have to add them. For example, if you want to test for an interaction between two continuous variables, then you need a third continuous variable which is the product of the first two.
On 10/01/2016 10:36 PM, Elizabeth Bartlett wrote:
Hello,
It doesn't appear that my question posted to the forum. Is there anything I need to do in order for the question to post?
Thanks, Elizabeth
On Wed, Sep 28, 2016 at 6:03 PM, Elizabeth Bartlett <elizabeth.bartlett@stonybrook.edu mailto:elizabeth.bartlett@stonybrook.edu> wrote:
Hello all, I am using mri_glmfit (DODS method) to run a CT analysis with 2 groups and 4 covariates and have a couple of questions regarding the statistical tests performed within the group analyses: 1.Can Freesurfer test the change in model fit or delta R-squared in a hierarchical regression? As far as I can tell, there is only simultaneous regression. Alternatively, can I change the Sum of Squares Type to Type 1 (I think default is Type 3) to simulate a hierarchical regression? 2. I think the default model in FreeSurfer accounts for all other main effects. But, does it also account for all 2 and 3 way interactions, whether or not I specify any? In other words, is the default a fully factorial model? Thank you very much for your time! -Elizabeth
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