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- Isao Shoji, Tohru Ozaki
- 1998

This paper proposes a new local linearization method which approximates a non-linear stochastic differential equation by a linear stochastic differential equation. Using this method, we can estimate parameters of the nonlinear stochastic differential equation from discrete observations by the maximum likelihood technique. We conduct the numerical… (More)

- Isao Shoji
- Math. Comput.
- 1998

This paper investigates the rate of convergence of an alternative approximation method for stochastic differential equations. The rates of convergence of the one-step and multi-step approximation errors are proved to be O((∆t) 2) and O(∆t) in the Lp sense respectively, where ∆t is discrete time interval. The rate of convergence of the one-step approximation… (More)

- Jiming Liu, Yiuming Cheung, +23 authors Kazushi Ikeda
- 2007

- Atsushi Yoshimoto, Isao Shoji
- European Journal of Operational Research
- 1998

- Yuji Yasuda, Isao Shoji
- 2003

Bayesian inference that is able to combine statistical measurement approach and scenario analysis is effective exceedingly for measuring operational risk. In choosing the prior distribution, taking indicators that may be predictive of the risk of future losses, external circumstance and so forth into consideration makes it possible to obtain more realistic… (More)

- Hideyuki Takamizawa, Isao Shoji
- Finance and Stochastics
- 2003

The existing literature on credit risk valuation does not have a consensus on whether credit risk can explain the observed corporate-Treasury yield spreads. The purpose of this article is to estimate the investors' risk aversion of corporate bond market and to explain the credit spreads. We show that how much of the credit spreads is due to credit risk, and… (More)

- Isao Shoji
- 2016

We propose an analytical approximation of the term structure of interest rates under general diffusion processes of the short-rate and state variables. A method of approximating conditional moments as the solution to a system of ordinary differential equations is applied to the pricing of bonds. Numerical experiments based on two illustrative models show… (More)

- Isao Shoji
- 2008

This paper provides a semiparametric model to estimate processes of the volatility defined as the squared diffusion coefficient of a stochastic differential equation. Without assuming any functional form of the volatility function, we estimate the volatility process by filtering. We prove the consistency of the model in the sense that estimated processes… (More)