# Simult\_ and nonzero IRFs in higher-order approximations

**URL:** <https://forum.dynare.org/t/simult--and-nonzero-irfs-in-higher-order-approximations/4523>\
**Category:** Dynare help (legacy posts)\
**Created:** [2 March 2015 10:05 UTC](https://forum.dynare.org/t/simult--and-nonzero-irfs-in-higher-order-approximations/4523 "2015-03-02T10:05:41Z")\
**Posts on this page:** 1\
**Showing post:** 12

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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:** [30 August 2015 14:14 UTC](https://forum.dynare.org/t/simult--and-nonzero-irfs-in-higher-order-approximations/4523/12 "2015-08-30T14:14:42Z")

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The problem is the particular pruning scheme. As shown in Andreasen et al., pruning enlarges the state-space. In this case, the EMAS is characterized by three initial states instead of just one as in the Fernandez-Villaverde et al (2011) pruning. But you are currently initializing the pruned system with only one element of the enlarged state-space.

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