The Effects of Worker Heterogeneity on Duration Dependence: Low-Back Claims in Workers Compensation
利用加拿大严重腰背受伤工人的数据，估计了工伤保险索赔持续时间的模型，发现工人特征和经济激励显著影响其对索赔时长的反应，且考虑异质性会改变其他变量的估计结果。
We estimate models of workers compensation claim duration for a sample of Canadian workers with serious low-back injuries. The models extend recent duration research by allowing worker characteristics to affect duration dependence through the nonlocation parameters of the duration distribution. We compare results for modified Weibull models and piecewise-constant hazard rate models of duration dependence. The results show that workers' responses to elapsed claim duration vary significantly with their characteristics and with economic incentives to return to work. Further, allowing for heterogeneity in duration dependence effects can dramatically change the coefficient estimates of the variables that determine the location parameter of the duration distribution. © 2001 by the President and Fellows of Harvard College and the Massachusetts Institute of Technology