Institution: | 1. Department of Statistics , Carnegie Mellon University , Pittsburgh , PA , 15213 , USA;2. Los Alamos National Laboratory , TSA-1, MS F600, Los Alamos National Laboratory, Los Alamos , NM , 87545 , USA;3. Lucent Technologies, Software Production Research Department, Bell Laboratories , 263 Shuman Boulevard, Room 2F-319, Naperville , IL , 60566-7050 , USA;4. Department of Statistics and Pittsburgh Supercomputer Center , Carnegie Mellon University , Pittsburgh , PA , 15213 , USA |