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1.计价单位不一致,出口是美元,GDP是人民币,模型中也没有包括汇率
2.看数据就知道用的是名义值。这种做法不妥,应转换为实际值。
3.如果一定用表中数据做的话,也应该先取自然对数。
出口为一阶单整,模型形式为(C,N,0)
Null Hypothesis: D(LNX) has a unit root
Exogenous: Constant
Lag Length: 0 (Automatic based on SIC, MAXLAG=4)
t-Statistic Prob.*
Augmented Dickey-Fuller test statistic -4.311540 0.0040
Test critical values: 1% level -3.857386
5% level -3.040391
10% level -2.660551
*MacKinnon (1996) one-sided p-values.
Warning: Probabilities and critical values calculated for 20 observations
and may not be accurate for a sample size of 18
名义GDP在10%水平下一阶单整,模型形式(C,N,1)
Null Hypothesis: D(LNY) has a unit root
Exogenous: Constant
Lag Length: 1 (Automatic based on SIC, MAXLAG=4)
t-Statistic Prob.*
Augmented Dickey-Fuller test statistic -2.818657 0.0765
Test critical values: 1% level -3.886751
5% level -3.052169
10% level -2.666593
*MacKinnon (1996) one-sided p-values.
Warning: Probabilities and critical values calculated for 20 observations
and may not be accurate for a sample size of 17
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