dynare/tests/observation_trends_and_pref.../Trend_model_calib_prefilter...

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var Y_obs P_obs junk1 junk2;
varexo e_y e_p eps_junk;
parameters rho_y rho_p g_y g_p sigma_y sigma_p;
rho_y=0.5;
rho_p=0.5;
g_y=0.0001;
g_p=-0.0001;
sigma_y=0.001;
sigma_p=0.001;
model;
Y_obs = rho_y*Y_obs(-1)+sigma_y*e_y;
P_obs = rho_p*P_obs(-1)+sigma_p*e_p;
junk1 = 0.9*junk1(+1);
junk2 = 0.9*junk2(-1)+eps_junk;
end;
steady_state_model;
Y_obs = 0;
P_obs = 0;
junk1=0;
junk2=0;
end;
shocks;
var e_p; stderr 1;
var e_y; stderr 1;
var eps_junk; stderr 1;
end;
steady;
varobs P_obs Y_obs junk2;
observation_trends;
P_obs (g_p);
Y_obs (g_y);
end;