TY  - BOOK
AU  - Heckman,James L.
TI  - Causal parameters and policy analysis in economics : a twentieth century retrospective
AV  - HC54 H424C
PY  - 1999///
CY  - Cambridge, Mass.
PB  - National Bureau of Economic Research
KW  - CAUSATION
KW  - ECONOMETRIC MODELS
KW  - ECONOMETRICS
KW  - HISTORY
KW  - 20TH CENTURY
KW  - EVALUATION RESEARCH (SOCIAL ACTION PROGRAMS)
ER  -