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A comment on Berkson's Paradox. Parent comment

Re:Berkson's Paradox by kgwgk on Thursday March 25, 2021 @04:47AM (#26577777)
> Since the out group will exclude people with both traits there should also be a negative correlation there

Not necessarily. Imagine the traits are distributed uniformly and independently in [-1 1]. There is no correlation:

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If you select people with at least one positive trait you will find negative correlation in the group + but the correlation will still be zero in the group -.

    ++++++
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    ---+++
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Re:Berkson's Paradox by caddemon on Thursday March 25, 2021 @05:00AM (#26577856)
Makes sense, I was picturing more of a diagonal boundary but you're right the paradox doesn't specify the shape of the boundary. Thanks!
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