用suest命令比较组间系数,出现问题该怎么解决?用的程序如下:
xtpoisson EV intera intera2 i.h2 i.y,r fe
estimates store a
xtpoisson EV intera intera2 lnva lndestva i.h2 i.y,r fe
estimates store b
suest a b
a was estimated with a nonstandard vce (robust)
r(322)
test [a_mean]intera=[b_mean]intera
a not found
不知道我的命令是哪里错了呢?
烦请各位支招。感激不尽!


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