Great Steve, thanks a lot for your support!
The only think I see is that with this procedure you make a "mix" of the 3 years studied, isn't it? Is like you build one growth curve for each diet, and I don't know i this is correct because the initial weight in each year is different. Even when you use the initial weight as covariate, each studydate you have a kind of "average" of different weights, isn't it?
Can I ask for the interaction year*diet*studyday to solve this or this is not correct?
Thanks again
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