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我是新手,刚接触stata,我在用LLc进行单位要检验,这个没通过存在单位根,请问接下来怎么差分进行二阶序列检验呢?命令是什么?
. xtunitroot llc fer
Levin-Lin-Chu unit-root test for fer
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Ho: Panels contain unit roots Number of panels = 214
Ha: Panels are stationary Number of periods = 6
AR parameter: Common Asymptotics: N/T -> 0
Panel means: Included
Time trend: Not included
ADF regressions: 1 lag
LR variance: Bartlett kernel, 5.00 lags average (chosen by LLC)
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Statistic p-value
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Unadjusted t -1.2e+04
Adjusted t* 1.5e+04 1.0000
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请高手指点,多谢多谢~
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