permanent shock in stochastic simulation

[LittleFish]

http://www.dynare.org/manual/index_18.html

In deterministic simulation, we specify a permanent shock by the use of initval and endval.

But how to specify a permanent shock in stochastic simulation?

Thanks!

[kyri82]

Even though you have a permanent shock, you should type your model in stationary terms, otherwise it cannot be solved. I am not sure if that helps...