victorliou 发表于 2010-4-2 11:39 
请问哪本书有Heckman两步法的详细介绍?谢谢
You can find it under the topic of
"INCIDENTAL TRUNCATION IN A BIVARIATE DISTRIBUTION"
In Greene's textbook "Econometric Analysis".
In short,
1) the first step is a probit choice model
2) classicl regression model.
The model can be estimated by ML altogather.