# Compare VAR IRF of original series and percentage change of series

**URL:** <https://forum.dynare.org/t/compare-var-irf-of-original-series-and-percentage-change-of-series/12787>\
**Category:** General DSGE Modeling\
**Created:** [15 November 2018 01:27 UTC](https://forum.dynare.org/t/compare-var-irf-of-original-series-and-percentage-change-of-series/12787 "2018-11-15T01:27:27Z")\
**Posts on this page:** 1\
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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:** [15 November 2018 11:01 UTC](https://forum.dynare.org/t/compare-var-irf-of-original-series-and-percentage-change-of-series/12787/2 "2018-11-15T11:01:50Z")

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What exactly is your question? Im most DSGE models the levels of the variables can be scaled arbitrarily, rendering the levels meaningless. Percentage deviations are invariant to such scaling. Think about measuring output in euro or dollars. The levels would differ according to currencies, but the IRFs in percentage deviations would be the same.

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