Split-Plot design replicated in time

[Prabin_1988]

Hi, 

I want to analyze the effect of three treatments (whole plot) on fat content (response variable) of cheese over the storage period (lets say 1 week, 2 week, 3 week ....upto 7 weeks) (sub-plot). Would you please provide the code for PROC MIX procedure?

[sld]

An excellent resource for the MIXED (not "MIX") procedure is 

https://www.sas.com/store/books/categories/usage-and-reference/sas-for-mixed-models-second-edition/p... 

I suggest that you first make an effort at the code yourself. If you have questions after that, then you can post your code, a detailed description of your study, and an example data set.