做单位根检验出现Number of gaps in sample: 2

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为什么会这样
. ipshin lnifdi,lags(1)
Number of gaps in sample:  2
sample may not contain gaps
invalid syntax
r(198);
.

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关键词：Number Sample 单位根检验 gaps AMPL

It means that your time-series should not contain any gaps
https://www.statalist.org/forums/forum/general-stata-discussion/general/533372-sample-may-not-contain-gaps-while-conducting-zandrews

铁锷未残 发表于 2018-9-7 19:36
It means that your time-series should not contain any gaps
https://www.statalist.org/forums/forum/g ...

请问怎么解决呢？