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Dear FreeSurfer expert

I have a lme model with 3 timelines where one timeline is baseline. I two models y = intercept + time + group + sex + time_at_baseline and y = intercept +time +time² + group + sex +time_at_baseline

Both time² and time is significant after FDR. How can I decide which model is best?

Knut Jørgen Bjuland