[quote="Skin Blues"]If using LD% made an improvement, I'm sure it would have already been included. A quick google search shows that [url=http://www.beyondtheboxscore.com/2012/1/9/2690405/what-starting-pitcher-metrics-correlate-year-to-year]LD% only has a 0.11 correlation from year to year[/url], versus GB% and FB% which have Y2Y correlations of .85 and 0.81 respectively. That means incorporating LD% probably does more harm than good, and explains the omission.[/quote]
Yeah I'm sure it would have already been included, and as a predictor of future ERA this might be better, but should it be included when analyzing past performance? a year worth of performance? I think a year worth of data on balls in play with a higher than usual LD% and a higher than usual BABIP would just indicate that his stuff was just not good and it was hit hard, not that he had bad luck. Just some random thoughts, I always feel something is missing in all of these statistics.