缺失很正常啊，像你这里面学历这种，缺失就只能去掉。

Nobody can manage all issues at the very beginning. You may need more time and practice to get experience in terms of cleaning data, conducting some calculations and doing econometric analysis. Try to describe the problems and solve them one by one, with an informative example data presented. Gradually, you could cultivate a sense of dealing with data. Good luck.

我知道呀，可是下下来不知道为什么会有缺失值，而且这种去掉缺失值一个一个去掉也太麻烦了吧，有什么批量化的设计么？

drop if variable==.

好的，感谢

正常你是不需要自己去处理 missing values，Stata 在跑回归时会自动帮你去掉！