Abstract
This paper develops and estimates a continuous-time model of the term structure of interests under regime shifts. The model uses an analytically simple representation of Markov regime shifts that elucidates the effects of regime shifts on the yield curve and gives a clear interpretation of regime-switching risk premiums. The model falls within the broad class of essentially affine models with a closed form solution of the yield curve, yet it is flexible enough to accommodate priced regime-switching risk, time-varying transition probabilities, regime-dependent mean reversion coefficients as well as stochastic volatilities within each regime. A two-factor version of the model is implemented using Efficient Method of Moments. Empirical results show that the model can account for many salient features of the yield curve in the U.S.
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Notes
- 1.
In the context of continuous-time models, Landen [40] also uses a marked point process to represent Markov regime shifts in her model of the term structure of interest rates. However, we use a different construction of the mark space that simplifies the corresponding random measure. Other approaches to regime shifts include Hidden Markov Models (e.g. Elliott et al. [22]) and the Conditional Markov Chain models (e.g. Yin and Zhang [52]). An application of Hidden Markov Models to the term structure of interest rates can be found in Elliott and Mamon [23]. Bielecki and Rutkowski [8, 9] are examples of the application of conditional Markov Chain models to the term structure of interest rates.
- 2.
See Last and Brandt [41] for detailed discussion of marked point process, stochastic intensity kernel and related results.
- 3.
This simply means that m(t, A) −γ m (t, A) is a martingale.
- 4.
This is analogous to the representation of Markov regime shifts as an AR(1) process in discrete-time models.
- 5.
Absence of arbitrage is sufficient for the existence of the pricing kernel under certain technical conditions, as pointed out by Harrison and Kreps [38].
- 6.
It is possible that \(\frac{1} {f} \frac{\partial f} {\partial X^{\prime}}\) depends on X(t) and S(t) as well. Nonetheless in the broad class of affine models, \(\frac{1} {f} \frac{\partial f} {\partial X^{\prime}}\) is a constant that depends only on the bond’s maturity.
- 7.
- 8.
In order to obtain a closed form solution of the term structure of interest rates, we need to restrict σ 1 to be constant across regimes.
- 9.
In the regime switching model of Bansal and Zhou [5], the risk-neutral mean reversion coefficient is allowed to shift across regimes. But the term structure of interest rates can only be solved analytically under log linear approximation.
- 10.
In the more restrictive CIR models, \([\lambda ^{\prime}_{0,D}(S_{t-}) + X_{t}^{{\prime}}\lambda _{1,D} + X_{t}^{{\prime}}\varTheta _{1}(S)]\) is further restricted to be proportional to the variance of the state variables.
- 11.
In Ang and Bekeart [4], however, the market price of regime-switching risk is not explicitly defined. λ S (u, S, X) can be derived from the specification of the pricing kernel.
- 12.
Of course, A(τ, S) also depends on the factor loading B(τ) through the differential equation (3.18).
- 13.
See Siu [47] for a discussion of the pricing of regime-switching risk in equity market.
- 14.
Hamilton [37] and Filardo [29] are examples of regime-switching models of business cycles with time-varying transitions probabilities. In regime-switching models of interest rates, time-varying transition probabilities are assumed in Gray [35], Boudoukh et al. [10] and more recently Dai et al. [17] among others.
- 15.
To make our study comparable, we consider the roughly same sample period as that in Bansal and Zhou [5].
- 16.
Continuously compounded bond returns are \(H_{t+\varDelta t} \equiv -(\tau -\varDelta t)R_{t+\varDelta t}(\tau -\varDelta t) +\tau R_{t}(\tau )\), where R t (τ) is the yield on a τ-year bond at time t. Since we don’t have data on R t+Δ t (τ −Δ t), we approximate it by R t+Δ t (τ) for τ ≫ Δ t, where Δ t = 1 month. Also note that Corr(E t (H t+Δ t ), BC t ) = Corr(H t+Δ t , BC t ) under rational expectations.
- 17.
- 18.
As for model selection for regime switching models (or general Hidden Markov models), Scott [45] gave an excellent review on limitations of various criteria, including BIC and AIC.
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Acknowledgements
We would like to thank seminar participants at Federal Reserve Bank of Kansas City, North American Summer Meetings of Econometric Society and Missouri Valley Economics Association Annual Meetings for helpful comments. A part of the research is done while the first author is visiting Federal Reserve Bank of Kansas City. He is grateful for their hospitalities. The second author gratefully acknowledges financial support of National Science Foundation under DMS-1228244 and University Missouri Research Board.
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Wu, S., Zeng, Y. (2014). An Econometric Model of the Term Structure of Interest Rates Under Regime-Switching Risk. In: Mamon, R., Elliott, R. (eds) Hidden Markov Models in Finance. International Series in Operations Research & Management Science, vol 209. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-7442-6_3
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