I am trying to estimate an NK DSGE model to compare the impacts of different environmental policies on macroeconomic fluctuations in China. I am currently working on estimating the baseline model, and I ran into some questions with the posterior estimates. Specifically, the 90% HPD intervals (which I read in some other posts are like confidence intervals) have no width - for example, for rhoa, both the lower and upper bounds of the 90% HPD interval are 0.8576, which is the same as the estimated posterior mean.
I have attached a screenshot and my mod and data files below. If anybody could take a look and point me to what the issue could be, I would greatly appreciate it! Take care!