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John D. Cook Consulting Blog
18.10.2025
A recipe that turns trig identities into Fibonacci identities. In some sense Fibonacci numbers are like sines and Lucas numbers are like cosines.
19.10.2025
Update on converting between nines and sigmas as quality measures.
Demonstrating the the coordinates of uniformly distributed points on a sphere are uniform, uncorrelated, but dependent.
How to compute a confidence interval for a correlation coefficient, and how it is connected to a differential equation.