xi：命令可以把字符串直接转化为dummy
So next, I try to not use areg and instead list the gradeyear interactions with an xi: xi: reg score perc_HH i.grade*i.year i.grade*i.state i.state*i.year AY_pop* ** Now, my focal independent variable has a standard error, but many of the other dummy variables in my model ...
xi：命令可以把字符串直接转化为dummy