Introducing FanGraphs Stats: Offense and Defense
FanGraphs has a lot of metrics, ranging from the standard counting numbers that have filled baseball cards for decades to more complicated calculations and formulas. Odds are pretty good that if there’s something you want to know about a particular Major League player, we probably have a metric for it. However, up until today, we’ve lacked one number that answered two of the most basic questions that people ask: Who has been the best offensive player in the game, and who has been the best defensive player in the game?
You could get at those questions with the numbers we had, using a combination of metrics found on the site, but there wasn’t just a single number that simply answered those two questions. And, unfortunately, the lack of an available sum of offense or defensive value led to people occasionally substituting in a number that didn’t actually answer the question they were trying to answer. This was our fault, not theirs, but as of an hour ago, this has been rectified with the introduction of two new numbers here on FanGraphs.

