Uploaded May 2020 | Updated September 2026, 1 week ago

---

Today we're going to talk about Bayes' Theorem. This is one of those fundamental statistical concepts that underlies how statistics works. Understanding Bayes' Theorem is a key stepping stone towards understanding Bayesian statistics.

For a complete index of all the StatQuest videos, check out:
statquest.org/video-index

If you'd like to support StatQuest, please consider...
Patreon: patreon.com/statquest
...or...
YouTube Membership: youtube.com/channel/UCtYLUTtgS3k1Fg4y5tAhLbw/join

...buying a StatQuest Study Guide...

statquest.org/studyguides

...a cool StatQuest t-shirt or sweatshirt:
shop.spreadshirt.com/statquest-with-josh-starmer

...buying one or two of my songs (or go large and get a whole album!)
joshuastarmer.bandcamp.com

...or just donating to StatQuest!
paypal.me/statquest

Lastly, if you want to keep up with me as I research and create new StatQuests, follow me on twitter:
twitter.com/joshuastarmer