“There are a lot of numbers in football that measure success. Goals and points are the original analytics, and newer stats such as expected goals and possession value are just increasingly fine-grained ways to model how likely goals are to happen. They’ll give you the bottom line: is this team or player doing things that help put the ball in the net or keep it out? Basically, are they good at football? It’s harder to measure how they’re good at football. …”
The Athletic