qiangli 发表于 2010-3-2 20:03 
你为什么不看看一本计量经济学的书呢
why ask this question?
i have four paper books here, two from 古扎拉蒂two from 卡特希尔
and some more digital books and eviews user guider.
i asked this question after reading...can not understand that is why i want some help form experts. is there anything wrong?