use "C:\Users\nojko\Dropbox\My PC (DESKTOP-35V8EGV)\Documents\EMUPP_2021\Mikroekonometrija_2021\ars2002_zene.dta" 
*** Ocena plata OLS
regress lnwage experience sk1 sk2 sk3 sk4 indus services own3, robust
*** Ocena plata - Heckman-ov dvostepeni metod
heckman lnwage (experience sk1 sk2 sk3 sk4 indus services own3), select (have_job1=age age2 m_stat1) twostep
*** Ocena plata OLS
regress lnwage experience educ indus services own3, robust
*** Ocena plata - Heckman-ov dvostepeni metod
heckman lnwage (experience educ indus services own3), select (have_job1=age age2 m_stat1) twostep
*** Ocena plata - Heckman-ov ML metod
heckman lnwage (experience educ indus services own3), select (have_job1=age age2 m_stat1)
heckman lnwage (experience educ indus services own3), select (have_job1=age age2 m_stat1) mills(mymills)