tag:blogger.com,1999:blog-4159906646513306121.post4869874085954122877..comments2023-11-19T20:38:50.237-08:00Comments on Economic Logic: Better educated twins live longerEconomic Logicianhttp://www.blogger.com/profile/10171296292101248614noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-4159906646513306121.post-71345937681098434502012-10-23T08:38:25.112-07:002012-10-23T08:38:25.112-07:00If I understand correctly, the fact that they get ...If I understand correctly, the fact that they get the same result with or without twins indicates that there is indeed such an effect from education, and the other variables do not matter. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4159906646513306121.post-66383211761110958552012-10-23T08:12:40.141-07:002012-10-23T08:12:40.141-07:00An obvious caveat in the twin studies design is th...An obvious caveat in the twin studies design is the basic assumption that all unobservables are the same between twins. But if all of the unobservables are the same why would the twins end up with different education? <br /><br />An example: think if one of the twins was dropped on her head as a kid and ends up being dumber. The dumber twin might leave school earlier, but might also die earlier because of the head trauma in youth. Their identification strategy is not immune to this. It may even be that their result is entirely driven by this.O.K.noreply@blogger.com