Submitted on: 16 June 2010.
Revised on: 29 July 2010.
Accepted on: 16 August 2010.
Metron-International Journal of Statistics
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Submitted on: 10 October 2008.
Revised on: 21 November 2008.
Accepted on: 13 December 2008.
Metron-International Journal of Statistics
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Submitted on: 21 March 2012.
Revised on: 16 April 2012.
Accepted on: 24 April 2012.
Metron-International Journal of Statistics
Submitted on: 12 January 2007.
Revised on: 20 January 2007.
Accepted on: 03 February 2007.
Metron-International Journal of Statistics