. xtunitroot llc GHGs

Levin-Lin-Chu unit-root test for GHGs
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Ho: Panels contain unit roots               Number of panels  =     26
Ha: Panels are stationary                   Number of periods =     14

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        -5.8450
Adjusted t*         -3.1695        0.0008
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弱问下，结果中的t值要比较的那个临界值是怎么计算出来的呢？还是直接看P value就好了呢？谢了哈~