用xtunitroot的时候,在选项中加入 demean ,即减去cross-sectional means时,可以减轻截面相关的影响。
demean requests that xtunitroot first subtract the cross-sectional averages
from the series. When specified, for each time period xtunitroot computes
the mean of the series across panels and subtracts this mean from the
series. Levin, Lin, and Chu suggest this procedure to mitigate the impact
of cross-sectional dependence.


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