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I have data from a longitudinal parallel groups study where there are 46 subjects randomized to 1 of 5 treatment groups, each subject with roughly 13 observations over time on a given outcome measure. The data trends in a U-shape over time, thus the quadratic term in the model. 4 active treatments are tested against placebo.

I am trying to decide whether it's more appropriate to use a repeated statement

repeated/ subject=subjid;

or a random statement

random int time /subject = subjid ;

Can you help me understand the differences in the model implications based on whether the repeated or random statement is used in SAS?

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Check out this link, it demonstrates why and when to use random vs repeated or both! http://www.theanalysisfactor.com/repeated-and-random-2/

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