3 ms·
The correlation here averages out to zero because X can be negative but Y can't, right, what are you trying to show here?
by whoisburbansky 6y ago
The correlation here averages out to zero because X can be negative but Y can't, right, what are you trying to show here?
- curiousgal 6y agoIt's a standard example of why non-correlation doesn't mean independence.
- klmadfejno 6y agoNot only that, but while there's no LINEAR correlation, there's a perfect non linear function that any half-credible scientist would identify.
- whoisburbansky 6y agoAgreed, but I still don't see how that's relevant to the Vitamin D/Covid severity correlation question. Presumably you aren't modeling either of the associated parameters with random variables that can be negative, and so even if one were a non linear function of the other, the linear correlation wouldn't be zero?
- klmadfejno 6y agoshrug. You could imagine, for example, that too little Vitamin D is bad, and too much is bad, and arrive at a similarly (flipped) nonlinear fit with negligible linear correlation