quietly xtreg fatal beertax spircons unrate perinck year2 year3 year4 year5 year6 year7, re
scalar theta=e(theta)
global yandxforhausman fatal beertax spircons unrate perinck year2 year3 year4 year5 year6 year7
sort state
foreach x of varlist $yandxforhausman{
by state:egen mean`x'=mean(`x')
gen md`x'=`x'-mean`x'
gen red`x'=`x'-theta*mean`x'
}
scalar theta=e(theta) 运行出错，怎么修改