http://reply.papertrans.cn/1/20/1975/1975-21.png
http://reply.papertrans.cn/1/20/1975/1975-22.png
http://reply.papertrans.cn/1/20/1975/1975-23.png
http://reply.papertrans.cn/1/20/1975/1975-24.png
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http://reply.papertrans.cn/1/20/1975/1975-29.png
Submitted on: 15 March 2017.
Revised on: 26 May 2017.
Accepted on: 15 June 2017.
___________________Annual Review of Statistics and Its Application