结果:找到“di abs”相关内容84个,排序为按回复时间降序,搜索更多相关帖子请点击“高级”
tvdiff显示no abservation
4 个回复 - 2627 次查看
请各位大佬看一下为什么用tv
diff做多期DID的平行趋势检验显示no observation了呢?大概有154万个观测值,控制变量有10个,工企98-05的非平衡面板,下面是具体命令. tv
diff tfp_op D $Xs,model(fe) pre(4) post(7) te ...
2021-11-25 09:24 - WangZihan2001 - Stata专版
Absolute C++ 4th Edition
6 个回复 - 1529 次查看
Absolute C++ (4th E
dition)
Walter Savitch (Author)
http://www.amazon.ca/Absolute-4th-E
dition-Walter-Savitch/dp/0136083811
2015-6-1 10:55 - Nicolle - C与C++编程