对面板数据坐单位根检验时我用的LLC检验，看到论坛上有两者命令方式，分别做了一下，结果的出来的结果完全不同，求大神指导，好郁闷啊！急急急！！！！

1. levinlin lnintra ,lags(1)

Levin-Lin-Chu test for lnintra    Deterministics chosen: constant

Pooled ADF test, N,T = (31,15)    Obs = 403   
Augmented by 1 lags (average)     Truncation: 7 lags

coefficient    t-value        t-star       P > t
-0.13093       -7.186      -3.24801      0.0006

2.. xtunitroot llc lnintra

Levin-Lin-Chu unit-root test for lnintra
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Ho: Panels contain unit roots               Number of panels  =     31
Ha: Panels are stationary                   Number of periods =     15

AR parameter: Common                        Asymptotics: N/T -> 0
Panel means:  Included
Time trend:   Not included

ADF regressions: 1 lag
LR variance:     Bartlett kernel, 7.00 lags average (chosen by LLC)
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                    Statistic      p-value
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Unadjusted t         0.1091
Adjusted t*          1.4109        0.9209
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