请问这个检验是通过了吗？存在单位根吗？
. xtunitroot llc lnreward
Levin-Lin-Chu unit-root test for lnreward
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Ho: Panels contain unit roots               Number of panels  =     22
Ha: Panels are stationary                   Number of periods =     18
AR parameter: Common                        Asymptotics: N/T -> 0
Panel means:  Included
Time trend:   Not included
ADF regressions: 1 lag
LR variance:     Bartlett kernel, 8.00 lags average (chosen by LLC)
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                    Statistic      p-value
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Unadjusted t        -0.5032
Adjusted t*          1.9019        0.9714
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