Negative exogenous shocks in a stochastic context

[homer05]

Hi,

Is there anyway to stipulate that in a stochastic model the exogenous shock is negative. e.g. instead of producing impulse response graphs for a positive shock it produces one for a negative shock?

Many thanks and my apologies if this question turns out to have an obvious and already explained answer.

[MichelJuillard]

There is no option to do that in Dynare, but if you change the sign of the shock in the model, a positive impulse to the modified shock will give you the response to a negative impulse to the original shock.

Best

Michel

[homer05]

Woops. I should've thought of that previously. Thanks a lot Michel!