Dear Dr Martin,
I have longitudinal database for subjects scanned multiple times. I want to study the changes in cortical thickness over time. I prepared my longitudinal table ( column#1 fsid column#2 fsid-base column#3 group column#4 bilateral motor cortex thickness column#5 time (years) column#6 disease duration)
Then I followed the instructions like in wiki... and I plot the changes in motor cortex over time using the command :
lme_lowessPlot(M:,5),Y(:,1)m0.7,M(:,3))
My questions are:
1. How can I regress the effect of disease duration (column#6) ? is it by running the previous command line by replaceing M(:,5) ( time) by M(:,6) disease duration?
2. If I am interested in studying the change in cortical thickness by the change in clinical scale over time is it correct to replce the coloumn #5 ( time) by a column for the clinical scales?
Thanks in advance for any advice!
Bests,
John
John
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