# Shock value for impulse response

**URL:** <https://forum.dynare.org/t/shock-value-for-impulse-response/20613>\
**Category:** Stochastic simulations\
**Created:** [26 June 2022 12:17 UTC](https://forum.dynare.org/t/shock-value-for-impulse-response/20613 "2022-06-26T12:17:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![asprilqjs](https://forum.dynare.org/letter_avatar_proxy/v4/letter/a/b9bd4f/32.png) [@asprilqjs](https://forum.dynare.org/u/asprilqjs)\
**Post date:** [26 June 2022 12:17 UTC](https://forum.dynare.org/t/shock-value-for-impulse-response/20613/1 "2022-06-26T12:17:51Z")

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I am a novice at DSGE. Now I have an uncertainty: is the initial shock value of impulse response a standard deviation of shock?

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**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:** [26 June 2022 15:58 UTC](https://forum.dynare.org/t/shock-value-for-impulse-response/20613/2 "2022-06-26T15:58:04Z")

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Linear models are scale-invariant, so the IRF scale linearly. By default, Dynare will show IRFs to a one standard deviation shock.