abnormal impulse response figure

[Mandy]

hello!
I run a DSGE model with dynare, but the impulse response figure seems strange.
The figures are like waves fluctuating frequently in the first periods.

What is the problem? Thank you in advance!

[Daniel Bendel]

You may have wrong timing.

[jpfeifer]

Exactly, wrong timing of the predetermined states often results in complex eigenvalues and thus oscillating IRFs.

[Mandy]

Thank you very much！but I don't know what does "wrong timing" mean?

[Mandy]

Does it mean I should change the code about "stoch_simul" ?
I'm very confusing. Thank you!

[jpfeifer]

It means there is a mistake in your model equations. Most probably a confusion of timing, i.e. you use for example k(-1) when it should be k or c when it should be c(+1).

[Mandy]

Oh I see. Thank you very much! I appreciate your help!:)