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Estimating Parameters of Short-Term Real Interest Rate Models

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  • Mr. Vadim Khramov

Abstract

This paper sheds light on a narrow but crucial question in finance: What should be the parameters of a model of the short-term real interest rate? Although models for the nominal interest rate are well studied and estimated, dynamics of the real interest rate are rarely explored. Simple ad hoc processes for the short-term real interest rate are usually assumed as building blocks for more sophisticated models. In this paper, parameters of the real interest rate model are estimated in the broad class of single-factor interest rate diffusion processes on U.S. monthly data. It is shown that the elasticity of interest rate volatility—the relationship between the volatility of changes in the interest rate and its level—plays a crucial role in explaining real interest rate dynamics. The empirical estimates of the elasticity of the real interest rate volatility are found to be about 0.5, much lower than that of the nominal interest rate. These estimates show that the square root process, as in the Cox-Ingersoll-Ross model, provides a good characterization of the short-term real interest rate process.

Suggested Citation

  • Mr. Vadim Khramov, 2013. "Estimating Parameters of Short-Term Real Interest Rate Models," IMF Working Papers 2013/212, International Monetary Fund.
    • Handle: RePEc:imf:imfwpa:2013/212
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