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*035  $a(EXLNZ-47BIBSYS_NETWORK)990210138964702201
*035  $a(NO-LaBS)14900948(bibid)
*035  $a(NO-TrBIB)021013896
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*040  $aNO-TrBIB$bnob$ekatreg
*24500$aSimple estimators for treatment parameters in a latent variable framework with an application to estimating the returns to schooling
*260  $aCambridge, Mass.$bNBER$c2000
*300  $a34 s.
*4901 $aNBER working paper series$v7950
*7001 $aHeckman, James$_47952900
*7001 $aTobias, Justin L.$_47953000
*7001 $aVytlacil, Edward$_29457300
*7102 $aNational Bureau of Economic Research (Forente Stater)$_13074800
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v7950$w999105437124702201$_13074900
*901  $a60
*999  $aoai:nb.bibsys.no:990210138964702202$b2021-11-14T19:59:01Z$z990210138964702202
^