Heckman两阶段概述.ppt

Heckman Selection Model 赫克曼备择模型 赫克曼二阶段备择模型 王志刚有几篇关于Heckman备择模型的文章。 select(...) specifies the variables and options for the selection equation. It 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. If depvar_s is specified, it should be coded as 0 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 missing are assumed not selected. ?The Stata package has two components: the executable and the ado-files. . update executable, force ?. update ado, force Heckman lw education age children, select(age married children education) nolog STATA 对大小写敏感。 Heckman lw education age children, select(w=age married children education) nolog BDC END