In this paper, we use the Box numerical method to compute implied bond
and option prices starting from the general CKLS interest rate model
based on Japanese interbank data. In particular, we compute numericall
y implied prices from the CKLS, Vasicek, Cox-Ingersoll-Ross and Brenna
n-Schwartz models. We also compare the prices with those obtained from
the exact analytical formulae of the Cox-Ingersoll-Ross model. We fin
d that the implied bond and option prices vary across models for Japan
. (C) 1998 IMACS/Elsevier Science B.V.