如题，stata用eventdd命令做平行趋势图时，出现variable _lf_Ptime_2 not found的报错，我的变量里没有这个_lf_Ptime_2，命令的编写也是按照例子来的，很费解
eventdd HFF number gender depend education avg_health risk_prefer bus_insurance_avg house_num LNtotal_income LNcurrent_asset LNtotal_consump  baoxiaobili LNmedic_debt i.year , timevar(treatpost) method(, cluster(hhid)) baseline(0) graph_op(ytitle("HFF"))
麻烦各位大神帮忙看看，谢谢