applecess 发表于 2012-2-22 18:17 
这个很简单的哦~进行单位根检验就可以了啊,具体有好几种单位根检验
ADF单位根检验命令为:dfuller y,noco ...
我也在做平稳性,我想麻烦你帮我看一下我的结果~~
我用ADF检验得到数据是I(1),结果如下面:
. dfuller dLNURHL
Dickey-Fuller test for unit root Number of obs = 1012
---------- Interpolated Dickey-Fuller ---------
Test 1% Critical 5% Critical 10% Critical
Statistic Value Value Value
------------------------------------------------------------------------------
Z(t) -29.451 -3.430 -2.860 -2.570
------------------------------------------------------------------------------
MacKinnon approximate p-value for Z(t) = 0.0000
也就是差分序列是平稳的,可是我用KPSS对差分序列检验,结果却是下面的:
KPSS test for dLNURHL
Maxlag = 21 chosen by Schwert criterion
Autocovariances weighted by Bartlett kernel
Critical values for H0: dLNURHL is level stationary
10%: 0.347 5% : 0.463 2.5%: 0.574 1% : 0.739
Lag order Test statistic
0 .93
1 .867
2 .842
3 .803
4 .779
5 .76
6 .748
7 .73
8 .712
9 .7
10 .689
11 .672
12 .657
13 .641
14 .627
15 .613
16 .602
这该怎么办呀,还能做协整检验吗?