我做的面板数据做下来P值都为1,不知道哪里出了问题求指教,谢谢
xtunitroot ips CPI
Im-Pesaran-Shin unit-root test for CPI
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Ho: All panels contain unit roots Number of panels = 18
Ha: Some panels are stationary Number of periods = 13
AR parameter: Panel-specific Asymptotics: T,N -> Infinity
Panel means: Included sequentially
Time trend: Not included
ADF regressions: No lags included
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Fixed-N exact critical values
Statistic p-value 1% 5% 10%
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t-bar 1.2978 -2.020 -1.870 -1.790
t-tilde-bar 1.0849
Z-t-tilde-bar 13.7847 1.0000
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