The Effect of Sample Selection and Initial Conditions in Duration Models: Evidence from Experimental Data on Training
持续期模型中的样本选择与初始条件：来自培训实验的证据
The authors investigate the separate effects of a training program on the duration of participants' subsequent employment and unemployment spells. This program randomly assigned volunteers to treatment and control groups. However, the treatments and controls experiencing subsequent employment and unemployment spells are not generally comparable subsets of the initial groups. Standard practice in duration models ignores this issue, leading to a sample selection problem and…