# Signal and noise PCs

**URL:** https://isgw-forum.colorado.edu/t/signal-and-noise-pcs/716
**Category:** Theory & background
**Created:** [March 3, 2025, 11:10pm UTC](https://isgw-forum.colorado.edu/t/signal-and-noise-pcs/716 "2025-03-03T23:10:03Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Duncan](https://isgw-forum.colorado.edu/letter_avatar_proxy/v4/letter/d/ecc23a/32.png) [@Duncan](https://isgw-forum.colorado.edu/u/Duncan)
#### Post date: [March 3, 2025, 11:10pm UTC](https://isgw-forum.colorado.edu/t/signal-and-noise-pcs/716/1 "2025-03-03T23:10:03Z")

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Here’s a really nice talk detailing weird things that happen in high dimensions and signal/noise PCs:

[![](https://isgw-forum.colorado.edu/uploads/default/original/1X/bf1f12b2de2159951c935a11d3844e270690d92a.jpeg "MIA: Christina Chen, PCA and stratification in GWAS; Alex Bloemendal, primer on random matrix theory") ](https://www.youtube.com/watch?v=B7ub92OLw1g)