以下是引用小呆在2004-5-20 21:41:00的发言:
简要回答:
if the three variables are integrated (i,e Non-stationary) respectively, say, I(1), and if some combination of the three varibales is stationary(i,e, I(0) ), then we say the three varibale are cointegrated.
the statistical importance of cointegrationm is straightforward: if a variable is stationary, it is easy to handle with in terms of statistical inference,such as mean, variance, covariance and of course hypothesis testing.
例如:
宏观经济数据中(quarterly data, say), 消费和收入通常都是n##被过滤##tationary的,因此不便于我们研究。但注意到它们的一种线性组合:收入-消费=储蓄则是平稳过程。这时我们说消费和收入是cointegrated.
上面只是一个大意描述。
什么,你不知道什么叫stationary? 这这这........
小呆哥答得不错。Thanks a lot! 我准备把这作为答案背了。不过我也是因为觉得第一问问的太弱智,第二问问的有点不知所云,才有点疑惑的说。[em10]
为什么给期权定价不需要真实的概率,能不能简单讲一下
[此贴子已经被作者于2004-5-20 23:25:47编辑过]
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