Dear Freesurfers,
I have a couple of question regarding the averaged map and resultant statistics. Starting from a population composed by three groups (controls, patients1, and patients2), and considering that my statistical comparisons will be:
Controls-patients1 Controls-patients2 Patients1-patients2
1) Should I build my averaged subject by including all subjects (controls, patients1, and patients2), independently of the pairwise comparison? Or just using the two subgroups of subjects included in each comparison? In the first case, we would use the same averaged map in all comparison. In the latter case, we would obtain 3 different averaged maps (one for each comparison).
2) How would affect the chosen averaged map method to build the resultant statistic? Is just a question of displaying, or it indeef affects to the obtained results?
Sorry for these basic questions, but I need to be sure before running my cortical thickness analysis.
Thanks in adavance.
Best, Jose L. Cantero
--- Jose Luis Cantero, Ph.D. Laboratory of Functional Neuroscience Department of Physiology, Anatomy, and Cellular Biology University Pablo de Olavide Ctra. de Utrera, Km.1 41013 - Sevilla - Spain -
Phone: +34 954 977433 Fax: +34 954 349151 Email: jlcanlor@upo.es http://www.upo.es/neuroaging/es/