Affiliation: | Department of Mathematics and Statistics, Queens University, Kingston, Ontario K7L 3N6, Canada;Bedford Institute of Oceanography, Department of Fisheries and Oceans, P. O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada;Department of Statistics and Actuarial Science, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada E-mail: |