300030 Timisoara, Romania, Piata Victoriei nr.3, tel: +40.256-490.771, e-mail: office@cciat.ro
300575 Timisoara, Romania, Bv.Eroilor de la Tisa nr.22, tel: +40.256.490.772, e-mail: office@cciat.ro
# R: Robust SE library(sandwich); library(lmtest) coeftest(model, vcov = vcovHC(model, type="HC1"))