Re: [Freesurfer] Volume comparison between groups and QDEC

2017-05-16 Thread Douglas Greve
On 5/11/17 3:25 PM, John Anderson wrote: Hi Doug, Why Qdec offer "volume, area, thickness ,...etc " in the drop down menu "measures"? In this menu there are many measures and I understand that I can run surface based analysis depending on the choice of this drop down menu. Is this

Re: [Freesurfer] Volume comparison between groups and QDEC

2017-05-11 Thread John Anderson
Hi Doug, Why Qdec offer "volume, area, thickness ,...etc " in the drop down menu "measures"? In this menu there are many measures and I understand that I can run surface based analysis depending on the choice of this drop down menu. Is this Correct? Please see attached. Thank you for any

Re: [Freesurfer] Volume comparison between groups and QDEC

2017-05-11 Thread Douglas N Greve
I'm not sure I follow. If I understand, you are finding sig diff in PCG volume when you extract it the volume value for each subject (scaled by etiv) and process in SPSS. The part I don't understand is what you are doing with QDEC. I don't think QDEC can be used to test ROI volume. On

[Freesurfer] Volume comparison between groups and QDEC

2017-05-09 Thread John Anderson
Dear Dr Doug, I have two groups of subjects (80 patients and 40 controls). I analyzed the data using Freesurfer v6.0. I want to study the difference between the groups in "precentral gyrus volume". After "recon-all" I built Qdec table and I used Qdec to compute the comparison by including eTIV