agefem
agesq
ambexp
atanh
binexp
blhisp
bmi
cdots
dambexp
de
dhospexp
disea
doi
drugdol
Econometrica
educdec
exper
fairpoor
faminc
fatheduc
fchild
ffs
fmde
ghindx
healt
Heckman's
heteroskedasticity
hlthf
hlthg
hlthp
hospexp
husage
huscoll
huseduc
hushrs
huswage
idp
inpdol
inpmis
instype
lambexp
lfam
lfp
linc
lnambx
lnmeddol
lnum
lnw
Lnw
logc
lpi
mdeoff
mdvis
meddol
mentdol
mentvis
mhi
motheduc
Mroz
mtr
nonphysician
nonphysicians
notmdvis
num
nwifeinc
outpdol
physlm
pioff
pkgdown
PSID
repwage
ResearchPanel
sbp
september
Sinica
sjos
ss
Statistica
suppdol
tookphys
totadm
totchr
unem
vgood
wifecoll
xage
xghindx
Yulia
zper
Barreto
Bastos
Birnbaum
Genton
Heckman
IMR
Marchenko
MEPS
NBER
Nhanes
NHANES
Ogundimu
Souza
sampleSelection
ssmrob
Toomet
Zhelonkin
Henningsen
al
et
PSID
Econometrica
