Hi Nooshin, you can't do a statistical analysis with two data points. The you could look at a simple difference in the time points. If you have two time points for other subjects, you could get means and stddevs from them and compute a z-score of the change for you subject.

doug

On 6/12/13 2:56 PM, Nooshin Zadeh wrote:

Dear FreeSurfer Group

I wanted to Group Analysis with qdec. I have MRIs of one patient in two different dates and I wanted to do group analysis on them to see the changes.

I have "gender", "age", and "diagnosis".

In qdec deme, when I make the analysis based on "thickness", I receive the attached error. I do not know what is the reason. Any help and advice would be appreciated.

Thanks,

Nooshin
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