取对数前
Levin-Lin-Chu unit-root test for gbr
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Ho: Panels contain unit roots               Number of panels  =      4
Ha: Panels are stationary                   Number of periods =     16

AR parameter: Common                        Asymptotics: N/T -> 0
Panel means:  Included
Time trend:   Included

ADF regressions: 4.75 lags average (chosen by BIC)
LR variance:     Bartlett kernel, 8.00 lags average (chosen by LLC)
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                    Statistic      p-value
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Unadjusted t       -12.8689
Adjusted t*         -4.8363        0.0000
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取对数后
Levin-Lin-Chu unit-root test for lngbr
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Ho: Panels contain unit roots               Number of panels  =      4
Ha: Panels are stationary                   Number of periods =     16

AR parameter: Common                        Asymptotics: N/T -> 0
Panel means:  Included
Time trend:   Included

ADF regressions: 3.50 lags average (chosen by BIC)
LR variance:     Bartlett kernel, 8.00 lags average (chosen by LLC)
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                    Statistic      p-value
------------------------------------------------------------------------------
Unadjusted t        -0.1337
Adjusted t*          6.1965        1.0000
------------------------------------------------------------------------------

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