# this data file is supplied with gretl
open engel.gdt

# specify some quantiles
matrix tau = {.05, .25, .5, .75, .95}

# use levels of variables
QM1 <- quantreg tau foodexp 0 income --intervals

# use log-log specification, with two outliers removed
logs foodexp income
smpl obs!=105 && obs!=138 --restrict
QM2 <- quantreg tau l_foodexp 0 l_income --intervals