stata用系统GMM回归,回归方程为:xtabond2 RD2 1.RD2 pol Ins1 ownership age ROA size liq lev1 separation ind3,gmm(RD2,,lag(1,2)) iv(pol Ins1 ownership age ROA size liq lev1 separation ind3) twostep;
出现下面的错误
RD2: factor variables may not contain noninteger values
st_data(): 3598 Stata returned error
xtabond2_mata(): - function returned error
<istmt>: - function returned error
请问这是怎么回事,求大神帮忙啊


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