External Email - Use Caution
Dear all,
Im currently running a cortical thickness longitudinal analysis on a group of 50 patients. The difference between timepoints is less than 4months, so I do not expect large ageing effect (although there might be some). I would like to test for specific cortical changes after neurosurgery. I have read that it is not possible to run one-sample ttest within qdec, what alternatives do I have then.
- Could I just compute the average change in pc1 or rate? - Would it then be advisable to run a paired-ttest analysis between timepoints instead of merging the images using long_mris_slopes?
Any advice would be appreciated. Best, José
a paired t is probably fine. See https://surfer.nmr.mgh.harvard.edu/fswiki/PairedAnalysis
On 3/19/19 11:20 AM, Jose Pineda wrote:
External Email - Use Caution
Dear all,
Im currently running a cortical thickness longitudinal analysis on a group of 50 patients. The difference between timepoints is less than 4months, so I do not expect large ageing effect (although there might be some). I would like to test for specific cortical changes after neurosurgery. I have read that it is not possible to run one-sample ttest within qdec, what alternatives do I have then.
- Could I just compute the average change in pc1 or rate?
- Would it then be advisable to run a paired-ttest analysis between
timepoints instead of merging the images using long_mris_slopes?
Any advice would be appreciated. Best, José
-- José Angel Pineda-Pardo Postdoctoral Researcher hmCINAC - HM Puerta del Sur Av Carlos V 70, Móstoles, Spain
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
freesurfer@nmr.mgh.harvard.edu
-
Greve, Douglas N.,Ph.D. -
Jose Pineda