Hello,<br><br>I would like to be able to do 3-way anova in qdec, freesurfer version 4.3.1 and measure the cortical thickness and volume.  Is this possible?  I have 3 discrete factors, each with two levels:<br><br>age group: less/more than 50<br>

HIV: yes/no<br>Alzheimers: yes/no<br><br>When I try to click on the third discrete factor in the qdec design tab, it deselects one of the others.  Does it max out at two?<br><br>Thank you very much,<br>Jeff Sadino<br>