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army1987 comments on Rational Romantic Relationships, Part 1: Relationship Styles and Attraction Basics - Less Wrong
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Well, there is woman shortage in China, so...
By this much, in case anyone else is interested in checking.
Chinese census data is notoriously unreliable.
I can believe that. The World Factbook has different figures, but they are in the same direction. I don't know where they get their data from, though.
Sorry, I shouldn't have just stated a claim without some evidence.
Here are some examples of semi-obvious statistical manipulation happening in the Chinese census data. I don't necessarily agree with all of their conclusions (e.g., they assume that the One Child Policy applies to everyone), but there are enough signs of tampering for my taste.
Interesting. If the sex ratio at birth is that high but the sex ratio among the population is that close to 1, what becomes of those extra males who are born?
In most countries, there are more women than men, because women live longer. (Some evidence: http://www.ssa.gov/oact/STATS/table4c6.html and http://en.wikipedia.org/wiki/File:UKDemographics-Age.svg )
Possible additional hypotheses: the reason there are more men born than women is because of selective abortions. If the selection pressure for having males is stronger in rural areas/ among the poor (where economics factors make it substantially better to have sons than daughters), and the poor have a higher mortality rate, then you would expect to see an evening-out. (It may be difficult to find good data on this, but I haven't tried)
You may also find that men are more likely to emigrate, and if China has net emigration, then that would reduce the number of men overall. (There are other possibilities that rely on emigration, obviously. This seems possibly the most likely. Some research would probably be able to verify this)