http://reply.papertrans.cn/3/272/27115/27115-21.png
Submitted on: 16 October 2012.
Revised on: 19 November 2012.
Accepted on: 02 December 2012.
REVSTAT-Statistical Journal
Submitted on: 25 October 1998.
Revised on: 01 December 1998.
Accepted on: 08 December 1998.
REVSTAT-Statistical Journal---INST NACIONAL ESTATISTICA-INE
Submitted on: 31 January 2005.
Revised on: 22 February 2005.
Accepted on: 13 March 2005.
REVSTAT-Statistical Journal
Submitted on: 10 December 2011.
Revised on: 28 December 2011.
Accepted on: 07 January 2012.
REVSTAT-Statistical Journal---INST NACIONAL ESTATISTICA-INE
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Submitted on: 03 July 2004.
Revised on: 15 August 2004.
Accepted on: 26 August 2004.
REVSTAT-Statistical Journal
Submitted on: 30 May 2008.
Revised on: 09 June 2008.
Accepted on: 28 June 2008.
REVSTAT-Statistical Journal---INST NACIONAL ESTATISTICA-INE
Submitted on: 27 December 2000.
Revised on: 18 January 2001.
Accepted on: 05 February 2001.
REVSTAT-Statistical Journal
Submitted on: 21 October 2008.
Revised on: 18 November 2008.
Accepted on: 13 December 2008.
REVSTAT-Statistical Journal