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有道理。美国的育龄人口来源有很多移民(合法+非法)。有些移民生育率比本土人高。
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08/14/2014 postreply
10:50:23
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tingfeng老师给了一种解读。两图或许有关联,但 相关index 可能就大有不同,information 太少了。
-ME_Professor-
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08/14/2014 postreply
10:51:37
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我觉得你的解读蛮好的。因为 信息量对我还是太少,我还真不能肯定解读。呵呵。
-ME_Professor-
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08/14/2014 postreply
11:06:24
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看看这个?情况比较复杂。
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08/14/2014 postreply
11:07:09
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Why is maternal mortality rising?
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08/14/2014 postreply
11:09:21
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make sense: 4 potential factors, and one more factor is
-ME_Professor-
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08/14/2014 postreply
11:22:15
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