chenyenting 发表于 2013-1-4 12:54 
是因為如果要加入三變數以上,cointegration vector 可能不只一個的關係嗎?      
因為在hansen and seo( ...
Testing for two-regime threshold cointegration....hansen and seo(2002)
page 5 已经有说明
case p=2, we suggest using a grid search over the two-dimensional space (beta;gamma). 
In higher dimensional cases,grid search becomes less attractive, 
and alternative search methods (such as a genetic algorithm, see Dorsey and Mayer, 1995)
might be more appropriate.