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Lumifer comments on Selling Nonapples - Less Wrong
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Given that he says that "In fact, you could be living with or married to one for 20 years or more and not know that person is a psychopath" and "This makes it almost impossible to distinguish between a genuinely talented team leader and a psychopath" I have to ask what kind of a definition for a "psychopath" is he using.
I suppose that would be one that relies on complex tests administered by a professional.
The Guardian article commits the mortal sin of not naming the study or its year or coauthors, so I can't be sure about this, but when I search Google Scholar for Paul Babiak, I find this 2013 paper by Babiak et al. (Search its title for the full text; I can't get the link to behave.)
It seems primarily to be about methodology, and gives means and correlations on its own scale but doesn't venture a conversion to more conventional measures; but when you get right down to what it's doing, it's based on anonymous assessments of respondents' bosses collected through Amazon's Mechanical Turk, each consisting of 20 questions on a 5-point scale. If this is the method that the study behind the Guardian article is using, I'm very skeptical of its diagnostic validity. Among other things.