Hi Sinead, you cannot use QDEC for this design since it has one factor with 3 levels (only 2 levels possible now). You can create an FSGD file, follow the example here:

http://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf3G0V

doug

On 05/09/2013 06:42 AM, Sinead Kelly wrote:

Dear all,

I am trying to run statistical analysis on cortical thickness data using Qdec. I have one group of control subjects that are split into three genotype groups. I want to investigate if cortical thickness significantly between the three genotype groups. Is it possible to look at differences between three groups using Qdec? I am getting the following error when I try to analyse - ERROR: QdecGlmDesign::Create: zero factors!

I would really appreciate if anyone could shed some light on this for me as this is the first time I have used Qdec and I don't know what is causing this error.

Thank you for your help.

Sinead

-- Sinead Kelly Neuropsychiatric Genetics Group Trinity Centre St. James's Hospital Dublin 8

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer