Thank you Doug. I did compute the mean from all the ages.

Crystal

On 10/22/13 9:51 AM, "Douglas N Greve" greve@nmr.mgh.harvard.edu wrote:

Hi Crystal, that is ok. When you demean the ages, make sure you compute the mean from all the ages, not separate means for each group

doug

On 10/21/2013 05:30 PM, Franklin, Crystal G wrote:

...

Freesurfer,

I want to make sure I am setting up my group analysis correctly. I have 2 groups, one a control population and the other a patient population , that I am wanting to see where there are differences controlling for age. I set the group as the fixed factor and I demeaned the ages and used them as the nuisance factor. Is it necessary to demean the ages before running QDEC?

Thanks, Crystal

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