Dear Dr Martin,
Thanks you very much for your awesome clarification and your kindness!!
Bests,
John
Hi John,
X is the design matrix. The rows are the total number of time points for all subjects, the columns the different parameters of your model.
In the wiki example, the first column
Hi John,
X is the design matrix. The rows are the total number of time points for
all subjects, the columns the different parameters of your model.
In the wiki example, the first column is all 1s (intercept) the second
is the time_from_baseline and other parameters that are in the matrix M
Hi Dr Martin
I want to study the change in cortical thickness overtime in one group of subjects.
I have only one group of subjects who scanned multiple times ( two time points and more)
I followed the pipeline exactly as in wiki.
I want to inquire about X in this case . Is it supposed to be 1
Hi Freesurfer experts,
I am working on a logitudinal data analysis using freesurfer pipeline. I followed all the steps like in WIKI and the analysis was great. Kindly I have the following questions:
1. In wiki "http://freesurfer.net/fswiki/LinearMixedEffectsModels"-- in the example mentioned
Hi John,
a few answers, maybe Jorge has more details when he get’s back from travel.
1. if you look at the wiki: Y = M(:,7:9), therefore these are the left and
right hippo-volumes. So the plot shows the total hippocampal volume.
2. I think you need to plot them individually. Probably you
Hi Martin,
I am working on a logitudinal data analysis using freesurfer pipeline. I followed all the steps like in WIKI and the analysis was great. Kindly I have the following questions:
1. In wiki "http://freesurfer.net/fswiki/LinearMixedEffectsModels"-- in the example mentioned there, the
