外挂指令 selmlog 可在此下载安装
http://www.parisschoolofeconomic ... mlog/selmlog13.html,基本上其可视为 Heckman sample selection model 的扩充版 (从"两"种选项到"多"项选择),我刚开始学操作,但出现
- . selmlog ca ca0, sel(err = lgdp openness pcgdpg resimp inf lgov totg_sd fd kaopen) dmf(0)
- Non-missing values of dependent variable for more than one outcome
- variable _m* not found
- r(111);
复制代码不知是否有人知道原因与修正之方法?而资料基本统计量如下:
- . sum code year `data'
- Variable | Obs Mean Std. Dev. Min Max
- -------------+---------------------------------------------------------
- code | 0
- year | 2,473 1997.796 8.419072 1981 2010
- err | 2,473 1.864941 .6987305 1 3
- ca | 2,473 -2.388977 8.371165 -147.9973 38.78706
- ca0 | 2,473 -2.418662 7.821923 -86.99418 38.78706
- -------------+---------------------------------------------------------
- lgdp | 2,473 24.63528 2.06703 19.18418 29.39713
- gdp | 2,473 2.90e+11 6.46e+11 2.15e+08 5.85e+12
- pcgdpg | 2,473 2.268787 4.482528 -19.39828 60.49918
- openness | 2,473 79.04535 52.51719 11.46605 504.8837
- inf | 2,473 .0901435 .1282166 -.5585228 .9915609
- -------------+---------------------------------------------------------
- totg | 2,473 .056595 .1385802 -.8426914 1.17041
- totg_sd | 2,473 .1097317 .0866075 .0085777 .655063
- kaopen | 2,473 .2860712 1.529947 -1.903586 2.374419
- fopen | 2,473 2.015458 3.392984 .1636595 75.75742
- fd | 2,473 .3146659 .2209474 .0277514 1
- -------------+---------------------------------------------------------
- lgov | 2,473 2.657519 .3807671 1.090425 3.791274
- resimp | 2,473 3.985075 3.502114 .0022146 36.78194
复制代码