SIZE为寻找好的工具变量
xtreg tfpch2 Emp2 Cap1 Hci Gov Inn Ind SIZE,fe
estimates store fe
ivregress 2sls tfpch2 Emp2 Cap1 Hci Gov Inn Ind (SIZE=L.SIZE L2.SIZE)
estimates store iv
hausman iv fe, constant sigmamore
请问这样写ok?
或者
qui xtreg tfpch2 Emp2 Cap1 Hci Gov InnInd,fe
estimates store fe
qui xtreg tfpch2 Emp2 Cap1 Hci Gov InnInd SIZE,fe
estimates store fe_vi
hausman fe_vi fe