求助!用suest命令比较组间系数,出现"unable to generate scores for model a"这个问题该怎么解决?用的程序如下:
xtpoisson EV intera intera2 i.h2 i.y, fe
. estimates store a
. xtpoisson EV intera intera2 lnva lndestva i.h2 i.y, fe
. estimates store b
. suest a b
unable to generate scores for model a
suest requires that predict allow the score option
r(322);


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