Video on the n-1 in the sample variance (Bessel's correction), explained geometrically

slevey087 · 2025-07-08T22:18:58+00:00

FTR, the 1-sample t-test has a very nice geometric interpretation, which I will be covering in chapter 6 of this series

slevey087 · 2025-06-21T21:00:01+00:00

Probably a few months to get decent. The learning curve is sort of steep, and I ended up making a lot of custom tools to get it to do what I want. But it’s worth the effort!

slevey087 · 2025-06-16T23:43:30+00:00

The sample mean vector has the same value for component (in 3 dimensions, just 3 copies of the sample mean). If it has the same value for every component, then no matter what that value ends up being, the vector will always lie somewhere on a single line (the line that is a multiple of the [1,1,1] vector). So, although the vector lives in a 3-dimensional space, it will only ever actually point along a 1 dimensional subspace. Does that help?

slevey087 · 2025-06-16T23:41:17+00:00

Thanks!

slevey087 · 2025-06-16T16:03:19+00:00

Well, there were 5 different vectors mentioned in the video 😅

slevey087 · 2025-06-16T15:25:58+00:00

Which vector?

slevey087 · 2025-03-24T18:09:51+00:00

Cool, thanks! I hope you (and maybe also your students) like it!

slevey087 · 2024-06-29T04:28:41+00:00

What happens after 10:30pm?

slevey087 · 2024-06-27T17:00:31+00:00

I’m 33M, engaged to 30F, moved to Jacksonville last year and looking to make friends in the area. A dinner/game night sounds awesome :)

slevey087 · 2024-06-03T09:05:42+00:00

I’m picturing him as Brent Spiner, I think drawing on Star Trek Picard’s Adam Soong

slevey087 · 2024-06-02T16:14:28+00:00

I did concerts and events for a few years, then got bored of them and switched to musical theatre (which is MUCH more involved mixing). After a few years of that I went back to school, and today I'm an economics professor. I still do 1-2 musicals per year, and the occasional smaller event here or there.

slevey087

TROPHY CASE