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  3. John D. Cook Consulting Blog

John D. Cook Consulting Blog

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John D. Cook Consulting Blog

18.10.2025

Turning trig identities into Fibonacci identities

A recipe that turns trig identities into Fibonacci identities. In some sense Fibonacci numbers are like sines and Lucas numbers are like cosines.

John D. Cook Consulting Blog

19.10.2025

Quality metrics

Update on converting between nines and sigmas as quality measures.

John D. Cook Consulting Blog

19.10.2025

Distribution of coordinates on a sphere

Demonstrating the the coordinates of uniformly distributed points on a sphere are uniform, uncorrelated, but dependent.

John D. Cook Consulting Blog

19.10.2025

ODE to Fisher’s transform

How to compute a confidence interval for a correlation coefficient, and how it is connected to a differential equation.

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