Bayesian estimation: Log data density [Laplace approximation] is NaN

Estimation ML/Bayesian estimation
6
  1. phi_p is clearly not identified at first order as it is always multiplied by a qudratic term that is 0 in steady state and therefore drops out. Why is there no FOC containing
phi_p*(vpi-1)

as is usual?
2. See Estimation of parameters - #2 by jpfeifer
3. The correctness of the observation equations is hard to judge. You are not supposed to use the two-sided HP-filter. Also, it’s unclear whether the frequency of the interest rates in the data and the model matches.