Garrett comments on An Especially Elegant Evpsych Experiment - Less Wrong
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"When this curve was compared with a curve showing changes in reproductive potential over the life cycle (a pattern calculated from Canadian demographic data), the correlation was fairly strong. But much stronger - nearly perfect, in fact - was the correlation between the grief curves of these modern Canadians and the reproductive-potential curve of a hunter-gatherer people, the !Kung of Africa."
Can someone clarify this? What is this? At first I thought that it'd be the expected number of kids one would have over the rest of their life, but I don't see how that could go ever go up.