We describe a full maximum-likelihood fitting method of the popular single-
factor Vasicek and Cox-Ingersoll-Ross models and carry this out for term-st
ructure data from the UK and US. This method contrasts with the usual pract
ice of performing a day-by-day fit. We also compare the results with some m
ore crude econometric analyses on the same data sets. (C) 2000 Elsevier Sci
ence B.V. All rights reserved.