有两个问题想向大家请教,先谢谢了:
第一个,我有的变量是平稳的,有的是一阶单整的,这样咋办,能不能做协整,或者直接接建模呢?
第二个问题是:在单位根检验时eviers出的结果中,individual unit root和 common unit root 分别是什么意思,举个eviews出结果的实例,虽然都拒绝了原假设,但是不知道有什么区别:):
谢谢赐教:)
Group unit root test: Summary
Series: CF_ARGENTINA, CF_BRAZIL, CF_CHILE, CF_CHINA,
CF_COLUMBIA, CF_INDIA, CF_INDONESIA, CF_KOREA,
CF_MALAYSIA, CF_MEXICO, CF_PENU, CF_PHILIPPINES,
CF_VENEZUELA
Date: 03/05/09 Time: 14:07
Sample: 1980Q1 2007Q4
Exogenous variables: Individual effects, individual linear trends
Automatic selection of maximum lags
Automatic selection of lags based on SIC: 0 to 3
Newey-West bandwidth selection using Bartlett kernel
Cross-
Method Statistic Prob.** sections Obs
Null: Unit root (assumes common unit root process)
Levin, Lin & Chu t* -9.56135 0.0000 13 617
Breitung t-stat -2.54879 0.0054 13 604
Null: Unit root (assumes individual unit root process)
Im, Pesaran and Shin W-stat -8.92008 0.0000 13 617
ADF - Fisher Chi-square 139.173 0.0000 13 617
PP - Fisher Chi-square 219.683 0.0000 13 624
[此贴子已经被作者于2009-3-5 14:21:39编辑过]


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