Submitted on: 04 October 1999.
Revised on: 07 January 2000.
Accepted on: 18 February 2000.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE
Submitted on: 11 October 2009.
Revised on: 14 December 2009.
Accepted on: 13 January 2010.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE
Submitted on: 11 February 2003.
Revised on: 30 May 2003.
Accepted on: 11 July 2003.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE
Submitted on: 21 October 1999.
Revised on: 17 November 1999.
Accepted on: 17 December 1999.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE
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Submitted on: 11 November 2015.
Revised on: 15 February 2016.
Accepted on: 26 February 2016.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE
Submitted on: 02 November 2021.
Revised on: 07 January 2022.
Accepted on: 02 February 2022.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE
Submitted on: 18 December 2006.
Revised on: 20 January 2007.
Accepted on: 14 March 2007.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE
Submitted on: 18 March 2012.
Revised on: 11 May 2012.
Accepted on: 29 May 2012.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE
Submitted on: 13 June 2002.
Revised on: 23 July 2002.
Accepted on: 19 September 2002.
___________________Chilean Journal of Statistics---SOC CHILENA ESTADISTICA-SOCHE