heckman兩階段

1、,Heckman Selection Model赫克曼備擇模型赫克曼二階段備擇模型,1,2,,王志剛有幾篇關(guān)于Heckman備擇模型的文章。,3,4,5,6,7,8,9,10,11,12,,13,14,15,,16,17,,,,,18,19,,20,21,22,23,24,,select(...) specifies the variables and options for the selection equation. It

2、is an integral part of specifying a Heckman model and is required. The selection equation should contain at least one variable that is not in the outcome equation.,25,,If depvar_s is specified, it should be coded as 0

3、or 1, with 0 indicating an observation not selected and 1 indicating a selected observation. If depvar_s is not specified, observations for which depvar is not missing are assumed selected, and those for which depvar is

4、missing are assumed not selected.,26,27,,,28,29,,The Stata package has two components: the executable and the ado-files. . update executable, force . update ado, force,30,,Heckman lw education age children, select