We’ve never conducted an official poll, but for my money, the most difficult statistics on FanGraphs for a newcomer to figure out are Pitch Type Linear Weights, also called Pitch Values. If you’re scanning through a player page and come across something that says “wFB/C” you’d be forgiven for throwing up your hands and going outside to mow the lawn.

But fear not, we’ve updated our Library entry regarding Pitch Type Linear Weights with hopes of making that alphabet soup of a statistic easier to understand. These statistics measure how each pitch thrown changes the run expectancy of the individual plate appearance through their impact on the count. Pitch values aren’t something you’re likely to chart while you watch a game, but if used appropriately, they can provide a richer understanding of which pitches have been most effective during a given season.

As always, feel free to ask questions in the comments section, on Twitter @NeilWeinberg44, or during our weekly FanGraphs Q&A chats, Wednesdays at 3pm.