Affiliation: | (1) Statistics Department, Institute of Advanced Studies, Australian National University, P. O. Box 4, 2600 Canberra, A.C.T., Australia;(2) Statistics Department, The Faculties, Australian National University, P. O. Box 4, 2600 Canberra, A.C.T., Australia;(3) CSIRO Division of Mathematics and Statistics, P. O. Box 1965, 2601 Canberra City, A.C.T., Australia |