The Collapse of the Soviet Union and the Productivity of American Mathematicians

rudi 发表于 2012-9-30 18:28
我继续，供大家探讨：

如果假设在研究中：

只要是城市的劳动力人群，每个年龄组基本上还都有大学学历的（偶说的大样本）。

然后你想说的迁移什么的，想说民工么？民工拥有大学学历以上的比例是极低的。

davidbeckham23 发表于 2012-9-30 19:33
只要是城市的劳动力人群，每个年龄组基本上还都有大学学历的（偶说的大样本）。

然后你想说的迁移什么 ...

我估计rudi指的是广义迁移人群，不是特指农民工。

davidbeckham23 发表于 2012-9-30 18:33
只要是城市的劳动力人群，每个年龄组基本上还都有大学学历的（偶说的大样本）。

然后你想说的迁移什么 ...

可以指户口移民和非户口移民（民工？），也可以单指后者。

rudi 发表于 2012-9-30 18:36
可以指户口移民和非户口移民（民工？），也可以单指后者。

这样的高学历非本地出生人口在一二三线城市的差别很大，一线城市基本上每个年龄组都有不少，但是到了三线城市以下就比例极低了。

davidbeckham23 发表于 2012-9-30 18:46
这样的高学历非本地出生人口在一二三线城市的差别很大，一线城市基本上每个年龄组都有不少，但是到了三线 ...

或者最低限度地，只考虑城市层面上的educ X mig分组，那么0值问题是否仍然严重？

如果仍然严重，那么有没有什么方法处理？合并组别或者是在0上面统一加上一个很小的正数（例如0.1....）？

rudi 发表于 2012-9-30 19:02
或者最低限度地，只考虑城市层面上的educ X mig分组，那么0值问题是否仍然严重？

如果仍然严重，那么有 ...

如果只是这个分组的话，应该不太严重，怕的是你再按照年龄什么的分组，那就问题有点大了。呵呵。

基本上大点的组还好。

davidbeckham23 发表于 2012-9-30 20:43
如果只是这个分组的话，应该不太严重，怕的是你再按照年龄什么的分组，那就问题有点大了。呵呵。

基本 ...

嗯，不得不如此吧，虽然大家都清楚这意味着相同教育水平，不同年龄的劳动者群体是完全替代的。。。

再发一个报道，今天在网上闲逛的时候找到的，看看两位作者如何说自己的文章：

“Although most of the impact from that wave of immigration may have already been seen, Doran said the migration helped produce better ideas, and the students of the Soviet faculty members have tended to do well. “They produce good students. The effects are long-lasting because of the effects of potential advisers,” he said.

The research raises the question, Borjas said, of whether high-skilled immigrants are beneficial to a country’s economy or not. Borjas has been a controversial figure to pro-immigrant groups who say he is anti-immigrant, and his research has sometimes thrust him into the polarized national debate.

“I think there is a really important intellectual question involved in all this, both in my past work and this paper. How do labor markets react to the influx of new workers? In the current context, the question is even more interesting because it involves new workers and new ideas,” Borjas said. In his view, there were two notable issues going on with the Soviet arrivals: a spillover of ideas that made the profession more productive, and completion among mathematicians “who just coincidentally happened to be doing Soviet-style math at the time.”

Doran said the authors had started with a hypothesis that the migration would lead to more research and papers by American scholars, but they found that the number of papers produced by the Americans actually decreased though it was offset by similar gains by the Soviet scholars. “The externalities were not big enough to compete against the downward forces,” he said meaning that the new skills and talent, though beneficial to a certain extent, also led to more competition for jobs."

全文见：http://www.insidehighered.com/ne ... d-field-mathematics

诸位终于回到讨论这篇文章上了。学习学习。我在劳动经济学原来关注不多，现在痛感这个大金矿原来真的被挖得不够好，诸位加油。不过指望现成数据，门都没有，我试过，诸位也别走偏了。

manchern 发表于 2012-9-30 22:32
诸位终于回到讨论这篇文章上了。学习学习。我在劳动经济学原来关注不多，现在痛感这个大金矿原来真的被挖得 ...

你用的是宏观，上述讨论都是微观。现存数据不是门都没有。。这个不能太武断。
就我了解的很多数据都可以做，更不说一些对我们保密（但一部分学者可以用的）的数据了。