How to change standard deviations of shocks？

Stochastic simulations
1

Dear all,
I have a question concerning the size of standard deviations of shock .Impulse response function is the impact of 1 unit standard deviation by default.
In a linear model I have four shocks: monetary policy shock, technology shock, cost-push shock and housing preference shock. If I want to change housing preference shock to 5 unit standard deviation, the rest donot change. Is there a way to do that?
Thank you！

2

I am not sure whether I have gotten your question correctly or not, however I think You should set shocks block as follows

shocks;
var v; // defined shock as varexo
stderr 0.1; // standard error of shock
[and similarly for other shoks]
end;

then you can easily change stderr to have desirable simulations.

3

At first order, the IRFs are linear. Thus, the IRF to a 5 standard deviation shock will simply be five times the IRF to a 1 standard deviation shock. IF you want to simulate You could use the simult_-function to generate any shock combination you want. See


for an example.

4

jpfeifer，for example,I have four shocks: monetary policy shock, technology shock, cost-push shock and housing preference shock. I want to amplify the impact of monetary policy shock, I want monetary policy shock is 10 or 100 times larger than the other, how should I do？
should I change “var eps_r=0.01” to “var eps_r=0.1”?
“shocks;
var eps_r=0.1;
var eps_a=0.01;
var eps_pi=0.01;
var eps_h=0.01;
estimated_params;
stderr eps_r,inv_gamma_pdf,0.1,2;
stderr eps_a,inv_gamma_pdf,0.01,2;
stderr eps_pi,inv_gamma_pdf,0.01,2;
stderr eps_h,inv_gamma_pdf,0.01,2;
”

5

What exactly are you trying to do? If you are estimating your model, that will determine the appropriate standard devation.

6

jpfeifer，in my linear(ized) model, I want to change the size of 1 unit standard deviation about monetary policy shock， whether could I change the size of 5 unit standard deviation？
I’m sorry I don’t know how to change size of shocks.

7

Again, for which purpose do you want to change the shock size? Only for displaying IRFs? Because in the above code you posted it, it was about estimation.