Statistica Sinica Posted on August 13, 2014 by SCG DR Copyright Holders: Statistica Sinica a Self-archiving policy Conditions Accepted version: X a Published version: X a Remarks: Copyright has been transferred to Statistica Sinica. It is not allowed to archive any version of papers published in Statistica Sinica. (verified by Zhao Yue via email) Verification Date: 01.08.2014