The Yield Curve through Time and Across Maturities

Richard Startz and Kwok Ping Tsang

No UWEC-2007-05, Working Papers from University of Washington, Department of Economics

Abstract: We develop an unobserved component model in which the short-term interest rate is composed of a stochastic trend and a stationary cycle. Using the Nelson-Siegel model of the yield curve as inspiration, we estimate an extremely parsimonious state-space model of interest rates across time and maturity. Our stochastic process generates a three-factor model for the term structure. At the estimated parameters, trend and slope factors matter while the third factor is empirically unimportant. Our baseline model fits the yield curve well. Model generated estimates of uncertainty are positively correlated with estimated term premia. An extension of the model with regime switching identifies a high-variance regime and a low-variance regime, where the high-variance regime occurs rarely after the mid-1980s. The term premium is higher, and more so for yields of short maturities, in the high-variance regime than that in the low-variance regime. The estimation results support our model as a simple and yet reliable framework for modeling the term structure.

Date: 2007-03
New Economics Papers: this item is included in nep-fmk, nep-mac and nep-mon
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