Re: [Freesurfer] Longitudinal analysis within one group

2014-01-31 Thread amirhossein manzouri
Dear Doug and Martin, Thanks a lot. I just have one group including 20 subjects. The scans have been done in a range of 0.9 to 1.5 years difference (tp2-tp1). Is ooh if I use the instructions from Paired Analysis : https://surfer.nmr.mgh.harvard.edu/fswiki/PairedAnalysis ? Regards, Best regards,

Re: [Freesurfer] Longitudinal analysis within one group

2014-01-31 Thread Martin Reuter
mreu...@nmr.mgh.harvard.edu Cc: Douglas Greve gr...@nmr.mgh.harvard.edu,free surfer freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Longitudinal analysis within one group Dear Doug and Martin,  Thanks a lot. I just have one group including 20 subjects. The scans have been done

[Freesurfer] Longitudinal analysis within one group

2014-01-30 Thread amirhossein manzouri
Hi, Would you please advise if it is possible to do longitudinal statistical analysis within a group with two time points in Qdec. And if it is not possible in Qdec how I suppose to do it? Best regards, Amirhossein Manzouri ___ Freesurfer mailing list

Re: [Freesurfer] Longitudinal analysis within one group

2014-01-30 Thread Douglas N Greve
you can't do it in qdec, use the command line stream, ie, mris_preproc, mri_surf2surf to smoooth, mri_glmfit, and mri_glmfit-sim doug On 01/30/2014 09:18 AM, amirhossein manzouri wrote: Hi, Would you please advise if it is possible to do longitudinal statistical analysis within a group with

Re: [Freesurfer] Longitudinal analysis within one group

2014-01-30 Thread Martin Reuter
Hi, with one group you want to check if atrophy is significantly different from zero? That is probably the case for any group (e.g. aging), so it won't tell you anything really. Also, if you don't find atrophy in a region it doesn't mean it's not there (only your group size is too small to