Multivariate Model

Hi everyone,

I’ve run Multivariate model in Stan, and I calculated Y-predicted for each Y(I have 5 Ys) and then I plotted with four chains. I don’t know how to interpret the results.
Can someone help me to interpret the plots?
This is a sample of figures and the black line is y-predict.

Another question:

LKJ prior distribution is used with correlation matrix, why do use it with covariance matrix and use it with Cholesky factor?

Can you post your model and maybe the summary table of the posterior samples?

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