年龄肯定没问题啊，取ln下，试试，有问题进我空间继续探讨

您好！我的数据是非平衡面板数据，对年龄这个变量进行单位根检验后结果是：
xtunitroot fisher aa（代表年龄变量）, dfuller lag(0)
(5639 missing values generated)

Fisher-type unit-root test for aa
Based on augmented Dickey-Fuller tests
--------------------------------------
Ho: All panels contain unit roots           Number of panels       =     72
Ha: At least one panel is stationary        Avg. number of periods =  40.68

AR parameter: Panel-specific                Asymptotics: T -> Infinity
Panel means:  Included
Time trend:   Not included
Drift term:   Not included                  ADF regressions: 0 lags
------------------------------------------------------------------------------
                                  Statistic      p-value
------------------------------------------------------------------------------
Inverse chi-squared(144)  P         0.0000       1.0000
Inverse normal            Z              .            .
Inverse logit t(4)        L*             .            .
Modified inv. chi-squared Pm       -8.4853       1.0000
------------------------------------------------------------------------------
P statistic requires number of panels to be finite.
Other statistics are suitable for finite or infinite number of panels.
------------------------------------------------------------------------------


这个结果显示单位根检验通过了吗？

对年龄变量一阶后进行单位根检验：
gen daa=d.aa
(5724 missing values generated)

. xtunitroot fisher  daa ,dfuller lag(0)
(5724 missing values generated)

Fisher-type unit-root test for daa
Based on augmented Dickey-Fuller tests
--------------------------------------
Ho: All panels contain unit roots           Number of panels       =     72
Ha: At least one panel is stationary        Avg. number of periods =  39.50

AR parameter: Panel-specific                Asymptotics: T -> Infinity
Panel means:  Included
Time trend:   Not included
Drift term:   Not included                  ADF regressions: 0 lags
------------------------------------------------------------------------------
                                  Statistic      p-value
------------------------------------------------------------------------------
Inverse chi-squared(144)  P         0.0000       1.0000
Inverse normal            Z              .            .
Inverse logit t(4)        L*             .            .
Modified inv. chi-squared Pm       -8.4853       1.0000
------------------------------------------------------------------------------
P statistic requires number of panels to be finite.
Other statistics are suitable for finite or infinite number of panels.
------------------------------------------------------------------------------


这个结果和没有一阶的结果一样，这个单位根检验结果通过了吗？