1. The Institute of Statistical Mathematics Research Organization of Information and Systems Tachikawa 190‐8562 Japan
2. Department of Advanced Materials Science The University of Tokyo Kashiwa 277‐8561 Japan
3. Department of Materials Science and Technology Tokyo University of Science Tokyo 125–8585 Japan
4. Research and Service Division of Materials Data and Integrated System National Institute for Materials Science Tsukuba 305‐0047 Japan
5. Department of Statistical Science The Graduate University for Advanced Studies Tachikawa 190‐8562 Japan