The Earnings Impact of Training Duration in a Developing Country: An Ordered Probit Selection Model of Colombia's Servicio Nacional de Aprendizaje (SENA)
用有序Probit模型纠正选择偏差，估计哥伦比亚SENA培训项目时长对收入的影响，发现纠正后收入效应显著下降。
This study estimates the earnings impact of one of the most extensive in-service training programs in the developing world, Colombia's SENA, through a comparison of nongraduates' and graduates' earnings profiles. The possible influence of selection is corrected through the use of an ordered probit model to determine participation in short and long courses. The correction causes a significant decline in SENA's earnings effect. The results are robust with respect to alternative specifications of the selection model.