Submitted on: 07 July 2016.
Revised on: 01 August 2016.
Accepted on: 28 September 2016.
___________________Journal of Statistical Planning and Inference
Submitted on: 24 November 2007.
Revised on: 09 January 2008.
Accepted on: 02 February 2008.
___________________Journal of Statistical Planning and Inference
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Submitted on: 15 April 2000.
Revised on: 25 May 2000.
Accepted on: 05 June 2000.
___________________Journal of Statistical Planning and Inference
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