我用王群勇教授的xthreg2这个命令在stata1里面运行,出现如下结果,There exist time-invariant individual(s) (maybe only one obs): sell roa top1 level age s
> l duity hold hight c_score
<istmt>: 3499 thestm2() not found
哪位大神知道是什么原因吗?
我用王群勇教授的xthreg2这个命令在stata1里面运行,出现如下结果,There exist time-invariant individual(s) (maybe only one obs): sell roa top1 level age s
> l duity hold hight c_score
<istmt>: 3499 thestm2() not found
您知道是什么原因吗?