As a FanGraphs reader, you are no doubt familiar with the many projection systems we display statistical lines from on the player pages of the site. These are fantastic models and I have mentioned many times how big a fan of the Steamer pitcher forecasts I am. Unfortunately, it is thought that these systems only have around a 70% accuracy rate, which may or may not seem high to you. The belief is that any additional factors added to the computer models will barely move the needle, so hope for an 80%+ success rate should probably be given up. That said, there are many reasons why these models cannot become better at projecting players, and it doesn’t have anything to do with the fact that we are dealing with human beings and no matter how much data we have, sometimes that .001% event happens. Projection systems have weaknesses and they are pretty easy to identify. Let’s discuss them, shall we?
Read the rest of this entry »