gmm()里面不允许有滞后期存在,应写成:
xtabond2 y yt-1 x1 x2 x3 x21 x22,gmm(y x1 x2 x3 x21 x22, laglimits(2 2)) noleveleq robust small nomata
laglimits (x y) indicated that the latest instrument is lagged x times and the earliest one is lagged y times
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最佳答案gmm()里面不允许有滞后期存在,应写成:
xtabond2 y yt-1 x1 x2 x3 x21 x22,gmm(y x1 x2 x3 x21 x22, laglimits(2 2)) noleveleq robust small nomata
laglimits (x y) indicated that the latest instrument is lagged x times and the earliest one is lagged y times
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