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Birth Order Effects: Nature vs. Nurture

Astral Codex Ten Podcast

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The Effect of Social Siblings in the Birth Order Effect

It seems to me that the effect is entirely caused by social siblings. I filtered for only people with one plus biological but zero social siblings. There were 20 oldest biological children in this group versus 21 second children, or 25 youngest children. This significantly differed from the approximately nor point seven fraction of older children in the general surveys.

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