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Submitted on: 14 October 2002.
Revised on: 07 February 2003.
Accepted on: 02 March 2003.
___________________JOURNAL OF BUSINESS & ECONOMIC STATISTICS
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Submitted on: 31 October 2017.
Revised on: 07 December 2017.
Accepted on: 25 January 2018.
___________________JOURNAL OF BUSINESS & ECONOMIC STATISTICS
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Submitted on: 13 June 1998.
Revised on: 29 July 1998.
Accepted on: 18 September 1998.
___________________JOURNAL OF BUSINESS & ECONOMIC STATISTICS