Your current codes do not match the description of what you planned.
The methods in your dissertation proposal describe a model that linearly regresses a response variable on both SLC and TRIAL1, with random coefficients. Both of these variables are ordered, so regression is a plausible approach. But because SLC and TRIAL1 are in the CLASS statement of your SAS codes, the models specified by your SAS codes treat SLC and TRIAL1 as classification (categorical) factors, so when either SLC or TRIAL1 or both appear in the MODEL statement, you get an ANOVA model, not a regression model.
Everyone starts learning statistical methods knowing nothing at the beginning. The modeling options for your study design are relatively complex, and your current understanding of these models is still very limited. You can certainly learn to do these models correctly, but there is a lot to learn, too much for me to take you through that process in this SAS Community forum. I highly recommend that you find help at your institution from a statistical consultant or faculty member, in addition to self-study and/or additional classes. These are wonderful tools for you to have at your disposal in the future, but these tools take work to acquire. Good luck and have fun!
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