作者: Edward Vytlacil , James Heckman , Xiaohong Chen
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摘要: ¤Early versions of the paper were presented at 1998 North American Summer Meetings Econometric Society, Canadian Study Group meeting in Western Ontario, Midwest Econometrics Indiana Bloomington, CREST Paris, CEME conference Pittsburgh, and seminars UCSD, UCR, USC, UCLA, UCB, Indiana, LSE, Virginia, Toronto, Rutgers University Bergen. We have bene...ted from comments received participants all those places, especially by Bo Honore, Joel Horowitz, Jim Powell, Jean-Marc Robin, Chris Taber Quong Vuong. The research second third authors was supported NSF 97-09-873, NIH R01-HD-34958-01 R01-HD32058-03.