Re: [Freesurfer] [External] Re: Comparing surface maps

2020-08-11 Thread Fotiadis, Panagiotis
External Email - Use Caution Ah I see. Great, thanks Doug!! Best, Panos From: on behalf of "Douglas N. Greve" Reply-To: Freesurfer support list Date: Tuesday, August 11, 2020 at 10:37 AM To: "freesurfer@nmr.mgh.harvard.edu" Subject: Re: [Freesurfer] [Ext

Re: [Freesurfer] [External] Re: Comparing surface maps

2020-08-11 Thread Douglas N. Greve
If you want to compare the maps, then the contrast would be [0 1] Imagine a scatter plot at each vertex with the values for one map on the x axis and the values for the other map on the y You then fit a straight line (offset and slope). The sig test will be for 0*offset+1*slope = slope If you

Re: [Freesurfer] [External] Re: Comparing surface maps

2020-08-11 Thread Fotiadis, Panagiotis
External Email - Use Caution Hi Doug, That’s extremely helpful, thank you! And just to verify: 1. Since I have 1 group and I just want to compare the two surface maps (without adjusting for other covariates like age/sex at the moment), my contrast matrix should be [1 0], rig