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generate plo = .
generate phi = .
generate ageaxis = _n + 17 in 1/78
setx educate 12 white 1 income mean
local a = 18
while `a' <= 95 {
setx age `a' agesqrd (`a'^2)/100
simqi, prval(1) genpr(pi)
_pctile pi, p(2.5,97.5)
replace plo = r(r1) if ageaxis==`a'
replace phi = r(r2) if ageaxis==`a'
drop pi
local a = `a' + 1
}
sort ageaxis
graph plo phi ageaxis, s(ii) c(||)