Dynare forums

Dear Prof. Pfeifer and all
The original model is perfect,but i meet some questions when i Modify the model to find the maximize welfare in the ramsey_policy command.I have checked many times.

Warning: Some of the parameters have no value (chi,
Wmin, ka, TT, phi, mu_L, mu_P) when using
Stoch_simul. If these parameters are not
Initialized in a strongystate file or a
Steady_state_model-block, Dynare may not be able
To solve the model
The operands of the || and the && operator must be able to be converted to logical scalar values.
Error dynare_solve (line 88)
If (~ ismember (options.solve_algo, [10,11])) &&
(Max (abs (fvec)) <tolf)
Error dyn_ramsey_static (line 70)
        [Inst_val, info1] =
        Dynare_solve (nl_func, ys_init (k_inst), ...
Error evaluate_steady_state (line 139)
        [Ys, params, info] =
        Dyn_ramsey_static (ys_init, M, options, oo);
Wrong (line 104)
[Dr.ys, M.params, info] =
Evaluate_steady_state (oo.steady_state, M, options, oo, 0);
Error stoch_simul (line 83)
    [Oo_.dr, info, M_, options_, oo_] =
    Resol (0, M_, options_, oo_);
Error ramsey_policy (line 38)
Info = stoch_simul (var_list);
Error model (line 1009)
Ramsey_policy (var_list_);
Error dynare (line 223)
Evalin ('base', fname);

Many thanks.

This is a bug, because Dynare does not provide a proper error message. The problem is that you specify a steady_state_model-block, but do not provide an instrument. Either delete the steady state file or provide
an instrument.

jpfeifer wrote:This is a bug, because Dynare does not provide a proper error message. The problem is that you specify a steady_state_model-block, but do not provide an instrument. Either delete the steady state file or provide
an instrument.

Thank you very much for your reply, I have improved some of the details of the model, but it still has a problem,i want to know where the problem lies and the solution.

many thanks

Warning: Matrices are singular values, close to singular values ​​or scaling errors. The results may be inaccurate. RCOND = NaN.
> In dyn_ramsey_static> dyn_ramsey_static_1 at 167
  In dyn_ramsey_static> @ (x) dyn_ramsey_static_1 (x, M, options_, oo) at 43
  In dynare_solve at 74
  In dyn_ramsey_static at 85
  In evaluate_steady_state at 139
  In resol at 104
  In stoch_simul at 83
  In ramsey_policy at 38
  In model at 1014
  In dynare at 223
Warning: Matrices are singular values, close to singular values ​​or scaling errors. The results may be inaccurate. RCOND = NaN.
> In dyn_ramsey_static> dyn_ramsey_static_1 at 167
  In dyn_ramsey_static> @ (x) dyn_ramsey_static_1 (x, M, options_, oo) at 43
  In dyn_ramsey_static at 86
  In evaluate_steady_state at 139
  In resol at 104
  In stoch_simul at 83
  In ramsey_policy at 38
  In model at 1014
  In dynare at 223
Error using print_info (line 34)
The model does not determine the current variables
Uniquely
Error stoch_simul (line 94)
    Print_info (info, options_.noprint, options_);
Error ramsey_policy (line 38)
Info = stoch_simul (var_list);
Error model (line 1014)
Ramsey_policy (var_list_);
Error dynare (line 223)
Evalin ('base', fname);

It is still a problem with steady state finding. I would recommed to specify an instrument and provide a conditional steady state file. Did your model work without Ramsey?

jpfeifer wrote:It is still a problem with steady state finding. I would recommed to specify an instrument and provide a conditional steady state file. Did your model work without Ramsey?

This is where I am puzzled, the original model is useful, steady state is also correct.The model works without Ramsey.Looking forward to your help.

If that step works, specify an instrument and rework your steady state file to work conditional on the instrument.