求助各路大佬!
多期DID平行趋势检验用的是下面的命令
xtreg Y xh* x1 x3 x4 x7 x9 x11 L i.year1,fe
coefplot, baselevels keep(xh*) vertical yline(0) ytitle("政策效应") xtitle("政策前后")
addplot(line @b @at) ciopts(recast(rcap)) scheme(s1mono) levels(95) coeflabels(xh2="-7" xh3="-6" xh4="-5" xh5="-4" xh6="-3" xh7="-2" xh8="-1" xh9="0" xh10="1" xh11="2" xh12="3" xh13="4") xline(8,lp(shortdash))
然后执行最后一个命令的时候出现了' ' found where ':' expected是什么意思呢?请问应该如何解决?谢谢谢!