1. Lecturer in Statistics, SIGMA, Coventry Univ., Coventry CV1 5DD, U.K. (corresponding author).
2. Reader, Dept. of Mathematical Sciences, Univ. of Liverpool, Liverpool L69 7ZL, U.K.
3. Professor, Dept. of Civil and Environmental Engineering, Center for Technology and Systems Management, Univ. of Maryland, College Park, MD 20742.
4. Ph.D. Candidate in Financial Mathematics, School of Mathematics, Univ. of Manchester, Manchester M13 9PL, U.K.
5. Senior Lecturer, School of Mathematics, Univ. of Manchester, Manchester M13 9PL, U.K.