如题！多期DID用 eventstudyinteract做动态效应检验如何加控制变量？只能用残差吗？下附stata代码：

forvalues l = 0/10 {
       gen L`l'event = dist==`l'
   }
forvalues l = 1/10 {
       gen F`l'event = dist==-`l'
   }
drop F1event
eventstudyinteract e L*event F*event, vce(cluster i ) absorb( i y ) cohort( 政策年份 ) control_cohort(nevercohort)
event_plot e(b_iw)#e(V_iw), default_look graph_opt(xtitle("Periods since the event") ytitle("Net profit") xlabel(-10(1)10)   ///
     name(SA, replace)) stub_lag(L#event) stub_lead(F#event) together