Commit 74d7c8a7 authored by Sébastien Villemot's avatar Sébastien Villemot
Browse files

Merge branch 'pf_init' into 'master'

Fix initialization of state variances

See merge request Dynare/dynare!1762
parents 5fd2a064 dab5d380
......@@ -135,14 +135,16 @@ end
switch DynareOptions.particle.initialization
case 1% Initial state vector covariance is the ergodic variance associated to the first order Taylor-approximation of the model.
StateVectorMean = ReducedForm.constant(mf0);
StateVectorVariance = lyapunov_symm(dr.ghx(mf0,:), dr.ghu(mf0,:)*Q*dr.ghu(mf0,:)', DynareOptions.lyapunov_fixed_point_tol, ...
[A,B] = kalman_transition_matrix(dr,dr.restrict_var_list,dr.restrict_columns,Model.exo_nbr);
StateVectorVariance = lyapunov_symm(A, B*Q*B', DynareOptions.lyapunov_fixed_point_tol, ...
DynareOptions.qz_criterium, DynareOptions.lyapunov_complex_threshold, [], DynareOptions.debug);
StateVectorVariance = StateVectorVariance(mf0,mf0);
case 2% Initial state vector covariance is a monte-carlo based estimate of the ergodic variance (consistent with a k-order Taylor-approximation of the model).
StateVectorMean = ReducedForm.constant(mf0);
old_DynareOptionsperiods = DynareOptions.periods;
DynareOptions.periods = 5000;
y_ = simult(DynareResults.steady_state, dr,Model,DynareOptions,DynareResults);
y_ = y_(state_variables_idx,2001:5000);
y_ = y_(dr.order_var(state_variables_idx),2001:5000); %state_variables_idx is in dr-order while simult_ is in declaration order
StateVectorVariance = cov(y_');
DynareOptions.periods = old_DynareOptionsperiods;
clear('old_DynareOptionsperiods','y_');
......
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