xsmle ratioef gdp cpi fdi_service_number population income ,fe model(sdm) wmat(ivdw) type(both) nolog effects nsim(500) durbin(gdp population fdi_service_number) ///DSM
est store sdm_fdiservicenumber
xsmle ratioef gdp cpi fdi_service_number population income ,fe model(sar) wmat(ivdw) type(both) nolog effects nsim(500) ///SAR
est store sar_fdiservicenumber
xsmle ratioef gdp cpi fdi_service_number population income ,fe model(sem) emat(ivdw) type(both) nolog effects nsim(500) //SEM
est store sem_fdiservicenumber
lrtest sdm_fdiservicenumber sar_fdiservicenumber ///LR test spatial lag
lrtest sdm_fdiservicenumber sem_fdiservicenumber ///LR test spatial error