000			02575cam a22003617 4500
001			w19742
003			NBER
005			20211020110043.0
006			m o d
007			cr cnu||||||||
008			210910s2013 mau fo 000 0 eng d
100	1		_aAbadie, Alberto. _94394
245	1	0	_aEndogenous Stratification in Randomized Experiments / _cAlberto Abadie, Matthew M. Chingos, Martin R. West.
260			_aCambridge, Mass. _bNational Bureau of Economic Research _c2013.
300			_a1 online resource: _billustrations (black and white);
490	1		_aNBER working paper series _vno. w19742
500			_aDecember 2013.
520	3		_aResearchers and policy makers are often interested in estimating how treatments or policy interventions affect the outcomes of those most in need of help. This concern has motivated the increasingly common practice of disaggregating experimental data by groups constructed on the basis of an index of baseline characteristics that predicts the values that individual outcomes would take on in the absence of the treatment. This article shows that substantial biases may arise in practice if the index is estimated, as is often the case, by regressing the outcome variable on baseline characteristics for the full sample of experimental controls. We analyze the behavior of leave-one-out and repeated split sample estimators and show they behave well in realistic scenarios, correcting the large bias problem of the full sample estimator. We use data from the National JTPA Study and the Tennessee STAR experiment to demonstrate the performance of alternative estimators and the magnitude of their biases.
530			_aHardcopy version available to institutional subscribers
538			_aSystem requirements: Adobe [Acrobat] Reader required for PDF files.
538			_aMode of access: World Wide Web.
588	0		_aPrint version record
690		7	_aC01 - Econometrics _2Journal of Economic Literature class.
690		7	_aC21 - Cross-Sectional Models • Spatial Models • Treatment Effect Models • Quantile Regressions _2Journal of Economic Literature class.
690		7	_aC9 - Design of Experiments _2Journal of Economic Literature class.
700	1		_aChingos, Matthew M.
700	1		_aWest, Martin R.
710	2		_aNational Bureau of Economic Research.
830		0	_aWorking Paper Series (National Bureau of Economic Research) _vno. w19742.
856	4	0	_uhttps://www.nber.org/papers/w19742
856			_yAcceso en línea al DOI _uhttp://dx.doi.org/10.3386/w19742
942			_2ddc _cW-PAPER
999			_c328381 _d286943