Reanalysis takes apart ENIGMA #ADHD study @TheLancetPsych. Would love to hear your thoughts (ping @Neuro_Skeptic).
https://www.madinamerica.com/2017/04/lancet-psychiatry-needs-to-retract-the-adhd-enigma-study/?utm_content=buffer4467d&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer …
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If you control for these things, you change the question from: brain size differences bwtn ADHDers and normies to
brain size diffs between ADHDers and normies GIVEN equal IQs. I.e. you subsample to the smarter ADHDers.
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So this paper wouldn't tell us anything.
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Kinda sorta. Depends what your precise question is. Depends on your causal model whether you want to control or not! If you think lower IQ
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is a confounder, i.e. both have same cause, then you prob want to control; but if you think lower IQ is effect of ADHD, then controlling is
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controlling for some of the indirect effects of ADHD. So, depends on your causal thinking. Both questions are relevant IMO.
End of conversation
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I see your point but if we don't control for IQ then we're saying "ADHD have lower IQ + brain size correlates with IQ" which we already know
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Which is.not the author's concl.; they conclude from not control. for IQ that ADHD is brain disorder.
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Does not look very volatile to me..https://twitter.com/KirkegaardEmil/status/846118871094480896 …
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I don't think that's the main point of the article, just the third word ;-). I was referring mostly to the 'anomalous results' section
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Sean: if you are interested in 1) ADHD ~ brain volume when 2) IQ ~ brain volume 3) ADHD ~ IQ you better add IQ in your model.
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Sure, present that too, and interpret accordingly. A lot of people interested in dev psych think IQ should always be controlled for. I don't
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May be subtle, but 'controllling for' has a sligthly diff meaning than "including in the model" - in the latter u r interested in its effect
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