命令如下:xtset code year,yearly
gen period=year-2014
tab period
gen pre_4=(period==-4)*treat
gen pre_3=(period==-3)*treat
gen pre_2=(period==-2)*treat
gen pre_1=(period==-1)*treat
gen Current=(period==0)*treat
gen post_1=(period==1)*treat
gen post_2=(period==2)*treat
gen post_3=(period==3)*treat
gen post_4=(period==4)*treat
drop pre_4
reghdfe CL pre_3 pre_2 pre_1 Current post_1 post_2 post_3 post_4,absorb(code year)vce(cluster code)
estimates store result
coefplot result,keep(pre_3 pre_2 pre_1 Current post_1 post_2 post_3 post_4)vertical recast(connect)lpattern(-)yline(0)
请问是命令中出现了错误吗?还是其他原因呢?求老师指点。鞠躬!


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