duplicates drop id date,force
xtset id date
gen ivol_next = F.ivol
drop if ivol_next ==  .

gen turn_next = F.turn
drop if turn_next ==  .


reghdfe ivol_next ivol buzzn buzzs size instown ret lev sdret  , absorb(id date)

请教大神们，这个报错我也看不懂到底哪里有问题