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Perturbation methods for Markov-switching DSGE models

Author

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  • Andrew T. Foerster
  • Juan F. Rubio-Ramirez
  • Daniel F. Waggoner
  • Tao Zha

Abstract

Markov-switching DSGE (MSDSGE) modeling has become a growing body of literature on economic and policy issues related to structural shifts. This paper develops a general perturbation methodology for constructing high-order approximations to the solutions of MSDSGE models. Our new method, called \"the partition perturbation method,\" partitions the Markov-switching parameter space to keep a maximum number of time-varying parameters from perturbation. For this method to work in practice, we show how to reduce the potentially intractable problem of solving MSDSGE models to the manageable problem of solving a system of quadratic polynomial equations. We propose to use the theory of Grbner bases for solving such a quadratic system. This approach allows us to first obtain all the solutions and then determine how many of them are stable. We illustrate the tractability of our methodology through two examples.

Suggested Citation

  • Andrew T. Foerster & Juan F. Rubio-Ramirez & Daniel F. Waggoner & Tao Zha, 2014. "Perturbation methods for Markov-switching DSGE models," FRB Atlanta Working Paper 2014-16, Federal Reserve Bank of Atlanta.
  • Handle: RePEc:fip:fedawp:2014-16
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    More about this item

    Keywords

    partition principle; naive perturbation; uncertainty; Taylor series; high-order expansion; time-varying coefficients; nonlinearity; Gröbner bases;
    All these keywords.

    JEL classification:

    • C6 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling
    • E3 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles
    • G1 - Financial Economics - - General Financial Markets

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