Affiliation: | 1 Institute of Mathematics, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland claudio.semadeni{at}a3.epfl.ch anthony.davison{at}epfl.ch 2 Department of Statistics and Applied Probability, University of California, Santa Barbara, California 93106-3110, U.S.Ahinkley{at}pstat.ucsb.edu |