Hi John,
the lowess plot can be misleading sometimes (as it is just the smoothed scatter
data per group and not controlled for anything). It is not a regression
analysis. Also note that the columns in your M matrix are not the same as in
the table (because you usually drop the first 2 columns a
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#
