Submitted on: 25 May 2013.
Revised on: 10 August 2013.
Accepted on: 06 September 2013.
___________________Annals of Applied Statistics---INST MATHEMATICAL STATISTICS-IMS
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Submitted on: 11 October 2002.
Revised on: 28 November 2002.
Accepted on: 16 December 2002.
___________________Annals of Applied Statistics---INST MATHEMATICAL STATISTICS-IMS
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