TY  - JOUR
AU  - Moffitt,Robert A.
TI  - Selection Bias Adjustment in Treatment-Effect Models as a Method of Aggregation
JF  - National Bureau of Economic Research Technical Working Paper Series
VL  - No. 187
PY  - 1996
Y2  - May 1996
UR  - http://www.nber.org/papers/t0187
L1  - http://www.nber.org/papers/t0187.pdf
N1  - Author contact info:
Robert A. Moffitt
Department of Economics
Johns Hopkins University
3400 North Charles Street
Baltimore, MD  21218
Tel: 410/516-7611
Fax: 410/516-7600
E-Mail: moffitt@jhu.edu
AB  - The aim of this note is to interpret estimation of the conventional treatment-effect selection-bias model in econometrics as a method of aggregation and to draw the implications of this interpretation.  In addition, the paper notes the connection of this interpretation with an older style of analysis using grouped data and illustrates the aggregation analogy with examples from the literature. The estimation technique used to illustrate the points is the method of instrumental variables.
ER  -