Submitted on: 12 October 2013.
Revised on: 20 January 2014.
Accepted on: 14 February 2014.
___________________Journal of the Korean Statistical Society
Submitted on: 06 November 1999.
Revised on: 19 February 2000.
Accepted on: 02 March 2000.
___________________Journal of the Korean Statistical Society
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Submitted on: 20 January 2004.
Revised on: 03 April 2004.
Accepted on: 20 May 2004.
___________________Journal of the Korean Statistical Society
http://reply.papertrans.cn/2/198/19793/19793-25.png
http://reply.papertrans.cn/2/198/19793/19793-26.png
http://reply.papertrans.cn/2/198/19793/19793-27.png
Submitted on: 29 May 2013.
Revised on: 15 July 2013.
Accepted on: 06 August 2013.
___________________Journal of the Korean Statistical Society
http://reply.papertrans.cn/2/198/19793/19793-29.png
Submitted on: 18 October 2008.
Revised on: 24 November 2008.
Accepted on: 30 December 2008.
___________________Journal of the Korean Statistical Society