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！

# How to change standard deviations of shocks？

**zwinner**#1

**a.bah**#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.

**jpfeifer**#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.