gwern comments on [Question] Adoption and twin studies confounders - Less Wrong

4 Post author: Stuart_Armstrong 11 July 2014 04:44PM

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Comment author: gwern 13 July 2014 02:42:16AM 4 points [-]

Why would this make them more different? Do you think one twin wins a resource competition and the other loses? Why do you think that?

I don't understand your questions. Why would it not make them more different? The competition introduces another source of variability: what fraction of the resources a particular fetus gets. A singleton has no such randomness, since it just gets 100%, there's no competition.