Null Hypothesis: Unit root (individual unit root process)     
Series: PEOPLE, GDP   
Date: 06/01/15   Time: 11:16   
Sample: 1999 2013   
Exogenous variables: Individual effects, individual linear trends   
Automatic selection of maximum lags   
Automatic lag length selection based on SIC: 1   
Total (balanced) observations: 11   
Cross-sections included: 1 (1 dropped)   
   
Method   Statistic Prob.**
ADF - Fisher Chi-square    14.8117  0.0006
ADF - Choi Z-stat   -3.23524  0.0006
   
** Probabilities for Fisher tests are computed using an asymptotic Chi   
        -square distribution. All other tests assume asymptotic normality.   
   
Intermediate ADF test results D(UNTITLED,2)   
   
   
Series Prob. Lag   Max Lag Obs
D(PEOPLE,2)  Dropped from Test  
D(GDP,2)  0.0006  1  1  11
   
每一步里都有dropped from test，什么意思啊