The Bill James Historical Baseball Abstract

If you go on Baseball-Reference and you scroll down to where they have, like, his trade history for the player, it could be any player, uh, the player's salary history, you'll see something called similarity scores.

And this was created by Bill James many years ago when he was writing the Baseball Abstract, and it's a way to determine what players are most similar to the player that you're examining.

Right.

So they go through everything from what position they played, to how many games they played, to what, how many times they batted, what their extra base hits were, batting average, slugging percentage, on-base percentage, strikeout rate, walk rate, all of these numbers.