Suspect identified in FanGraph’s R^2 theft: park factors

Okay. I’ve figured out the answer: park factors. The question, of course, is what vaporized so much of the variance explained by FanGraphs’s runs-produced above average statistic (wRAA) when FG converted it into the hitting element of its WAR measure. Park factors. Pretty much all of the loss—from nearly 90% to under 70% of variance […]