Heckman, James L. <br/><br/>
Causal parameters and policy analysis in economics : a twentieth century retrospective 

 - Cambridge, Mass. :  National Bureau of Economic Research,  1999 
 - 54 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CAUSATION--ECONOMETRIC MODELS<br/>ECONOMETRICS--HISTORY--20TH CENTURY<br/>EVALUATION RESEARCH (SOCIAL ACTION PROGRAMS)--ECONOMETRIC MODELS--HISTORY
<br/><br/><label>LC Class. No.: </label>HC54  / H424C