Submitted on: 08 February 2012.
Revised on: 18 May 2012.
Accepted on: 14 July 2012.
___________________AUSTRALIAN & NEW ZEALAND JOURNAL OF STATISTICS
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Submitted on: 18 January 2001.
Revised on: 08 May 2001.
Accepted on: 25 May 2001.
___________________AUSTRALIAN & NEW ZEALAND JOURNAL OF STATISTICS
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Submitted on: 17 January 2018.
Revised on: 27 February 2018.
Accepted on: 16 April 2018.
___________________AUSTRALIAN & NEW ZEALAND JOURNAL OF STATISTICS
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