In the next few videos, I'm going to embark on something that will just result in a formula that's pretty straightforward to apply. And in most statistics classes, you'll just see that end product. But I actually want to show how to get there. But I just want to warn you right now. It's going to be a lot of hairy math, most of it hairy algebra, and then we're actually going to have to do a little bit of calculus near the end. We're going to have to do a few partial derivatives. So if any of that sounds daunting or sounds like something that will discourage you in some way, you don't have to watch it.