Institution: | Daiwa Institute of Research Ltd. 15-6 Fuyuki, Koto-ku, Tokyo 135-8460, Japan ; Institute of Statistics, University of Vienna, Universitaetsstr. 5, 1010 Vienna, \mbox{Austria} ; Nippon Electric Control Equipment Industries Association, 2-1-17 Hamamatsu-cho, Minato-ku, Tokyo 105-0013 Japan ; Division of Mathematics, Integrated Human Studies, Kyoto University, Kyoto 606-8501 Japan |