Nearly parallel is nearly transitive

1 · John Cook · Aug. 6, 2019, 12:16 p.m.
We begin with a bit of geometry, then show its relevance to statistics. Geometry Let X, Y, and Z be three unit vectors. If X is nearly parallel to Y, and Y is nearly parallel to Z, then X is nearly parallel to Z. Here’s a proof. Think of X, Y, and Z as points […]...