Submitted on: 12 November 1998.
Revised on: 04 December 1998.
Accepted on: 23 January 1999.
___________________International Journal of Population Data Science (IJPDS)
Submitted on: 21 March 2019.
Revised on: 12 July 2019.
Accepted on: 08 August 2019.
___________________International Journal of Population Data Science (IJPDS)
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Submitted on: 07 February 2002.
Revised on: 14 March 2002.
Accepted on: 13 April 2002.
___________________International Journal of Population Data Science (IJPDS)
Submitted on: 01 June 2019.
Revised on: 02 September 2019.
Accepted on: 17 October 2019.
___________________International Journal of Population Data Science (IJPDS)
http://reply.papertrans.cn/2/140/13971/13971-26.png
http://reply.papertrans.cn/2/140/13971/13971-27.png
Submitted on: 26 September 2022.
Revised on: 31 October 2022.
Accepted on: 08 December 2022.
___________________International Journal of Population Data Science (IJPDS)
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Submitted on: 22 August 2001.
Revised on: 05 October 2001.
Accepted on: 18 October 2001.
___________________International Journal of Population Data Science (IJPDS)