TY  - BOOK
AU  - Heckman,James
TI  - Characterizing selection bias using experimental data
AV  - QA164 C427
PY  - 1998///
CY  - Cambridge, Mass.
PB  - National Bureau of Econimic Research
KW  - MATCHING THEORY
KW  - PARAMTER ESTIMATION
KW  - EXPERIMENTAL DESIGN
KW  - ECONOMETRIC DESIGN
ER  -