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# PS7.1 for example in Section 7.1
open data7-1
ols WAGE 0 D
genr n=$T
genr nm=sum(D)
genr wall=sum(WAGE)
genr wbar=wall/n
genr nf=n-nm
genr wm=sum(WAGE*D)
genr mbar=wm/nm
genr wf=sum(WAGE*(1-D))
genr fbar=wf/nf
print wbar nm mbar nf fbar