http://reply.papertrans.cn/1/80/7910/7910-31.png
Submitted on: 12 October 2002.
Revised on: 21 December 2002.
Accepted on: 19 January 2003.
___________________Econometrics Journal---OXFORD UNIV PRESS
http://reply.papertrans.cn/1/80/7910/7910-33.png
http://reply.papertrans.cn/1/80/7910/7910-34.png
Submitted on: 08 December 2019.
Revised on: 08 February 2020.
Accepted on: 24 March 2020.
___________________Econometrics Journal---OXFORD UNIV PRESS
Submitted on: 14 May 2008.
Revised on: 07 June 2008.
Accepted on: 07 July 2008.
___________________Econometrics Journal---OXFORD UNIV PRESS