Thanks Doug and how can check if the slopes are different? On Jan 12, 2014 12:33 AM, "Douglas Greve" greve@nmr.mgh.harvard.edu wrote:
Use DODS to test whether the slopes differ between the three groups. If they do not, then use DOSS. doug
On 1/11/14 5:03 PM, amirhossein manzouri wrote:
Thanks Doug for the prompt reply. I just want to if DODS is ok to be used in my case or I should use DOSS? On Jan 11, 2014 10:56 PM, "Douglas Greve" greve@nmr.mgh.harvard.edu wrote:
Hi Amirhossein, don't use the DOSS feature in QDEC because there is a bug such that it does not always do the right thing. Sorry, I sent out an email about 8mo ago on this, but it is not easy to let people know about a bug once the bug is out there. If you want to use DOSS, use mri_glmfit directly. If you still have a question,
then repost to the list.
doug
On 1/11/14 1:22 PM, amirhossein manzouri wrote:
Hello all, I am using Qdec (version5.1) to study cortical thickness differences between groups having Age as nuisance covariate. I do not have assumption if the groups are different or not . Using DODS and DOSS gives me completely different results. We have three groups including 41, 39, and 24 subjects in each. My question is which results design matrix type is more reliable for such a study? And also what if I include a covariate of interest in my comparison? Thanks in advance, Best regards, Amirhossein Manzouri
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