Submitted on: 15 October 2001.
Revised on: 10 November 2001.
Accepted on: 26 November 2001.
___________________Journal of Statistical Software
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Submitted on: 16 April 2004.
Revised on: 07 August 2004.
Accepted on: 30 August 2004.
___________________Journal of Statistical Software
Submitted on: 09 January 2009.
Revised on: 16 April 2009.
Accepted on: 01 June 2009.
___________________Journal of Statistical Software
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Submitted on: 12 March 2004.
Revised on: 13 May 2004.
Accepted on: 11 July 2004.
___________________Journal of Statistical Software
Submitted on: 05 May 2008.
Revised on: 26 August 2008.
Accepted on: 12 September 2008.
___________________Journal of Statistical Software
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Submitted on: 29 June 2015.
Revised on: 08 October 2015.
Accepted on: 05 December 2015.
___________________Journal of Statistical Software