HI freesurfer experts I have a question about the statistical analysis of longitudinal data. we have run our data through the longtudinal data processing stream.
We are looking at the longitudinal effect on the LGI data We are looking at doing a Mixed effects analysis. our main Model Factor (Independent Variable) of interest is drug usage. we have continuous data as to the amount of drug usage. Can this variable be continous variable, or do we have to break it up into discrete levels of usage ( example, low, middle, high) Thanks Jon
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