@bbolker.bsky.social on Bluesky

JavaScript RequiredThis is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is. Learn more about Bluesky at bsky.social and atproto.com.

Post

Ben Bolker

bbolker.bsky.social

did:plc:eo2un6k4yqwliqszd7wgkhbi

Thinking about singular fits and non-positive-definite correlation matrices (as one does), I (re)discovered the "elliptope". From Rousseeuw & Molenberghs. “The Shape of Correlation Matrices.” The American Statistician 1994: https://doi.org/10.1080/00031305.1994.10476079 Experiments here: https://bbolker.github.io/bbmisc/elliptope.html

2024-11-09T22:47:13.287Z