eddle 发表于 2012-3-9 17:22 
推荐看Chris Brooks的Introductory Econometrics for Finance,金融计量经济学导论,第8章,讲得明了清楚。
恩好的谢谢,我最近看了一下。不知道对不对,就是说,ARCH(q)其实是AR(q)的特殊版本因为它的variance 是conditional on the previous error. However, GARCH(p,q) allows more flexible and is a extensive version of ARCH,the variance not only depends on previous errors, but also depends on previous conditional variance