Multinomial Model - How to set Prior for categorical variables?

Hey @emiruz , Thank you so much for the response. I really appreciate the suggestions.

Sure I will write down the model in the thread. I posted my code in another thread where I am seeking solution to another error (Multinomial distribution for modelling Causal Models with all categorical variables).

I will look into BRMS as well and see how things work out.

Yes, rating is an ordinal variable. Does it suggest that I shouldn’t be using multinomial distribution ?