# Model Comparison

**URL:** https://discourse.macromodelbase.com/c/model-comparison/10.md

[Latest](https://discourse.macromodelbase.com/latest.md) · [Categories](https://discourse.macromodelbase.com/categories.md)

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## [About the Model Comparison category](https://discourse.macromodelbase.com/t/about-the-model-comparison-category/27)

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**Author:** [@MMBTeam](https://discourse.macromodelbase.com/u/MMBTeam)\
**Replies:** 0

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Principles of conducting model comparison and how to interpret the results can be discussed here.

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## [Unconditional variance: zeros and NaNs](https://discourse.macromodelbase.com/t/unconditional-variance-zeros-and-nans/71)

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**Author:** [@hawkins](https://discourse.macromodelbase.com/u/hawkins)\
**Replies:** 1\
**Last updated:** [December 10, 2019, 7:59pm UTC](https://discourse.macromodelbase.com/t/unconditional-variance-zeros-and-nans/71 "2019-12-10T19:59:11Z")

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Hi All, Running v2.3.2 to see how the Taylor rule works across models with a monetary policy shock, I encountered zeros and NaNs for a number of models (cf. below). Is this expected behavior or does it indicate an insta…