Abstract
Pricing bond options under the Cox, Ingersoll and Ross (CIR) model of the term structure of interest rates requires the computation of the noncentral chi-square distribution function. In this article, we compare the performance in terms of accuracy and computational time of alternative methods for computing such probability distributions against an externally tested benchmark. All methods are generally accurate over a wide range of parameters that are frequently needed for pricing bond options, though they all present relevant differences in terms of running times. The iterative procedure of Benton and Krishnamoorthy (Comput. Stat. Data Anal. 43:249–267, 2003) is the most efficient in terms of accuracy and computational burden for determining bond option prices under the CIR assumption.
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Notes
- 1.
As an example, consider a 10-year 6 % bond with a face amount of 100. In this case, N = 20 since the bond makes 19 semiannual coupon payments of 3 as well as a final payment of 103. That is, a i = 3, i = 1, 2, ⋯ , 19, a 20 = 3 + 100 = 103, and \(s_{1} = 0.5,s_{2} = 1,\cdots \,,s_{19} = 9.5,s_{20} = 10\).
- 2.
We obtained these probabilities by computing the values of \(F(x_{1};\nu,b_{1})\) for this set of parameters.
- 3.
This means that care must be taken if one wants to use the CDF built-in-function of Mathematica for computing the noncentral chi-square distribution function.
- 4.
The CPU time for the gamma series method is 3,303.23 s for probabilities, 3,340.48 s for zero-coupon bond options, and 10,714.40 for coupon bond options.
References
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Acknowledgments
Dias is member of the BRU-UNIDE and Larguinho and Braumann are members of the Research Center Centro de Investigação em Matemática e Aplicações (CIMA), both centers financed by the Fundação para a Ciência e Tecnologia (FCT). Dias gratefully acknowledges the financial support from the FCTs grant number PTDC/EGE-ECO/099255/2008.
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Larguinho, M., Dias, J.C., Braumann, C.A. (2014). Valuation of Bond Options Under the CIR Model: Some Computational Remarks. In: Pacheco, A., Santos, R., Oliveira, M., Paulino, C. (eds) New Advances in Statistical Modeling and Applications. Studies in Theoretical and Applied Statistics(). Springer, Cham. https://doi.org/10.1007/978-3-319-05323-3_12
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DOI: https://doi.org/10.1007/978-3-319-05323-3_12
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