Homosexuality and number of brothers: large meta-analysis confirms it as a real effect. https://www.ncbi.nlm.nih.gov/pubmed/28608293 pic.twitter.com/KaZYJWTv7m
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Umm, new index sounds a bit dodgy. Did they adjust for plain birth order, paternal age etc?
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@KirkegaardEmil@_r_c_a Blanchard seems determined to find this effect. Even if it is exists, it can only explain <20% of instances. -
15-29% assuming no measurement error etc. That's pretty good for a contributing source. 30% is r = .55.pic.twitter.com/AwF4rmmrGd
End of conversation
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