Stoch_sim generating same output

Stochastic simulations
1

Hello to all,

I calibrated a simple 3-equation DSGE and using stochastic simulations I noticed that the output (the empirical moments and the oo_.endo_simul) is always the same; shouldn’t they be different each time I run the code?

% Simple NKM Model

var y, i, r, pi, g, u,v;
varexo eps_g, eps_u, eps_v;

% Parameters

parameters beta, sigma, eta, omega, rhog,rhou,rhov ,phipi, phiy;

beta = 0.99;
sigma = 1;
eta  = 1;
omega= 0.8;
rhog = 0.8;
rhou = 0.5;
rhov = 0.5;
phipi= 1.5;
phiy = 0;


% Model equations

model (linear);
  #kappa= (sigma+eta)*(1-omega)*(1-beta*omega)/omega;
  y=y(+1)-(1/sigma)*(i-pi(+1))+g;
  pi= beta*pi(+1)+kappa*y+u;
  i=phipi*pi+phiy*y+v;
  r=i-pi(+1);
  g = rhog * g(-1) + eps_g;
  u = rhou * u(-1) + eps_u;
  v = rhov * v(-1) + eps_v;

end;

steady;

shocks;
  var eps_g; stderr 1;
  var eps_u; stderr 1;
  var eps_v; stderr 1;
end;

stoch_simul(periods=1000);

oo_.endo_simul

I am using Octave in Mac.

Thank you very much.

2

No, Dynare by default sets a random number generator seed. You can use simul_replic to get multiple paths.

3

Thank you very much for your reply.