Confidence intervals and polynomial fits
On May 6, 2011, at 4:27 PM, David Winsemius wrote:
On May 6, 2011, at 4:16 PM, Ben Haller wrote:
As for correlated coefficients: x, x^2, x^3 etc. would obviously be highly correlated, for values close to zero.
Not just for x close to zero:
cor( (10:20)^2, (10:20)^3 )
[1] 0.9961938
cor( (100:200)^2, (100:200)^3 )
[1] 0.9966219
Wow, that's very interesting. Quite unexpected, for me. Food for thought. Thanks! Ben Haller McGill University http://biology.mcgill.ca/grad/ben/