d SJ2-4 st0029. Demand system estimation d by Brian P. Poi, Stata Corporation d Support: bpp@stata.com d After installation, type help ^demand^ f st0029/demand.hlp f st0029/food.dta f st0029/lnl_quaids.ado f st0029/quaids.do f st0029/quaids_delta.ado f st0029/quaids_params.ado f st0029/quaids_vec.ado f st0029/vec_sum.ado