Good day for all. I have had write a script for treatment of panel data. I have had centered the observations with var - pmean(var), in the file I have a SEM, before the SEM I put smpl --no-missing, by the error "Gretl have find missing observations". Next when I run the script, again appear the error "Gretl have find missing observations" and before it the message "Isn't deleted any observation" in response to smpl command. The question is, Why gretl in script mode not remove the missing values if in mode console gretl is pretty obedient?. The script next: (gretl versión 2018c) <hansl> open datosenapanel.csv --quiet setobs Prod Anio --panel-vars rename ImpB M dummify Prod --drop-last loop i=1..3 rename DProd_$i cons$i endloop list Vars = seq(3,11) loop foreach i Vars c$i = $i - pmean($i) endloop smpl --no-missing Centrados <- system method=sur equation cY 0 cAC cPR cRend cIPPB equation cAC 0 cM(-1) cP(-1) cC(-1) cPR equation cP 0 cY cM cIPPB endog cY cAC cP end system </hansl> Thanks. Cordially, Luis Salazar