What's the effect size?
Tangent but only slightly, this is why science "prefers" experimental data and why observational data can only take us so far.
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Agree. Oberservational data can only be hypothesis generating, not testing.
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I'm not sure about that as it's a very strong statement — and I haven't had a chance to think about it too much — but, yes, 90% agreed.
End of conversation
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So yeah, not sure why anybody takes this seriously as implying smart phones have anything to do with depression.