# Numerical Noise in Impulse Response Functions **URL:** \ **Category:** Stochastic simulations\ **Created:** [20 November 2024 10:03 UTC](https://forum.dynare.org/t/numerical-noise-in-impulse-response-functions/26775 "2024-11-20T10:03:37Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Hopkins1](https://forum.dynare.org/letter_avatar_proxy/v4/letter/h/9de0a6/32.png) [@Hopkins1](https://forum.dynare.org/u/Hopkins1)\ **Post date:** [20 November 2024 10:03 UTC](https://forum.dynare.org/t/numerical-noise-in-impulse-response-functions/26775/1 "2024-11-20T10:03:37Z")
Hello everyone, I am working on a DSGE model using Dynare, and I have encountered an issue with the impulse response functions (IRFs) of key variables such as inflation, wage rates, consumption etc. Specifically, the responses exhibit extremely small values in the order of x10^{-15}, x10^{-16}, and x10^{-17}. How can I address these near-zero numerical values in the IRFs? I have attached the .mod file. [Gali\_Monacelli\_2005me6.mod](https://forum.dynare.org/uploads/short-url/f7PQWewg2LpRj9Vb6UMDmDc0IG6.mod) (6.3 KB) ---
**Author:** ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer)\ **Post date:** [20 November 2024 12:28 UTC](https://forum.dynare.org/t/numerical-noise-in-impulse-response-functions/26775/2 "2024-11-20T12:28:19Z")
See > [@Issues with the IRFs](https://forum.dynare.org/t/issues-with-the-irfs/19333/6): > > Have a look at the size of the response. If you set there will often be wiggles due to numerical error as the IRFs are not exactly 0 but so small any wiggles are meaningless. That is something that needs no addressing. ---
**Author:** ![Hopkins1](https://forum.dynare.org/letter_avatar_proxy/v4/letter/h/9de0a6/32.png) [@Hopkins1](https://forum.dynare.org/u/Hopkins1)\ **Post date:** [22 November 2024 07:08 UTC](https://forum.dynare.org/t/numerical-noise-in-impulse-response-functions/26775/3 "2024-11-22T07:08:55Z")
Thank you very much Professor.