system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do sports stat sites calculate odds to win?

I see these graphs on sports stat sites that calculate the odds that the Golden State Warriors will go 73-9.  How are these odds calculated?
gpt
Though historic analysis of the teams,  situation,  and betting patterns. These are payouts, and the job of the odds setter is to set the payouts do there is the same amount of money on both sides. That way regardless of who wins,  the book collects the vig or fee for placing the bet. As bets become lopsided on one side,  the payouts will move to induce more betting on the other side. You'll often see this recorded as where the book opened and where it is now.