我想做一个系统GMM,可是老是显示 2000b: operator invalid
我重装了xtabond2,又下载了14版的stata,可是还是不行。
命令如下,变量有点多。请大家帮忙看下究竟是哪里出了问题呢?
- xtabond2 abs_da l.abs_da D_accounting D_age D_gender D_degree Age_board Gender_board Independence Shareholding_top1 Share_TMT Size Lever Growth Roa Cap Tangible State i.Year i.CSRC1,gmm(abs_da D_accounting D_age D_gender D_degree Age_board Gender_board Independence Shareholding_top1 Share_TMT Size Lever Growth Roa Cap Tangible laglimits(2 2)) iv( State i.Year i.CSRC1) noleveleq noma robust small