[setareh amd]

Is this waht you wanted?

webuse nlswork , clear
xtqreg ln_wage age nev_mar union wks_ue ttl_exp i.year, i(idcode)
qregplot age nev_mar union wks_ue ttl_exp, ols olsopt(abs(idcode) robust) q(10(10)90) raopt(color(gs14))

[ATTACH=CONFIG]n1620434[/ATTACH]

thank you, would you please explain one of the graphs? I want to learn interpretation

[River Huang]

The command looks fine to me. I don't understand wht you meant by "it has shown the years seperately. i want specify years from 1386 to 1396"?

[setareh amd]

i meant xtqreg is used for panel data model, ok I specify X by "code" ,then how can i specify T by "year".