tRA

I would personally just use some sort of combination of RA and tRA for judging Retrospective value, and basically just tRA* for judging Retrospective skill.

Viva El Birdos vivaelpujols 2010

FIP and tRA are attempting to measure the same thing: what a pitcher's current rates stats should result in on a scale that equivalent to an ERA. tRA is a little more in depth because it uses expected values for batted ball outcomes to determine a relative runs allowed, wheres as FIP just converts rates stats into a equivalent of ERA. tRA* goes one step farther and regresses batted ball rates to the mean and then converts the outcomes into estimated run values, which can, I think, distort some of a pitcher's own skill slightly.

The Crawfish Boxes 2009

Coding for tRA was the final hurdle, but a bunch of help from the invaluable

Baseball Prospectus 2010

Using Statcorner's tRA WAR, you get 1.80 for Valverde and

Comments for FanGraphs Baseball cheap airforceoneshoes 2010

One other note on tRA: since it calculates ERA, an adjustment needed to be made that essentially resulted in the creation of tERA, which was the normal tRA value discounted by the difference-league and year dependent-between ERA.

Baseball Prospectus 2010

This explains why tRA does a little better than ERA predictions, as it attributes this performance aspect, which is largely luck-laden due to its inconsistency, to skill in addition to crediting him for his low 15.8 percent line-drive rate, which we know is also largely luck-driven.

Baseball Prospectus 2010

Well, Navarro was awesome in Jane's Addiction but that's not horrible in that park, and he's had some HR/FB bad luck (xFIPs like him better, although tERA doesn't, though it's "early" for tRA this season).

Royals Review 2010

Using Statcorner's tRA WAR, you get 1.80 for Valverde and 1.65 for Soriano.

Comments for FanGraphs Baseball cheap airforceoneshoes 2010

Blengino has even gone on record in saying that they're aware of tRA and how it works.

Comments for FanGraphs Baseball 2010

This explains why tRA does a little better than ERA predictions, as it attributes this performance aspect, which is largely luck-laden due to its inconsistency, to skill in addition to crediting him for his low 15.8 percent line-drive rate, which we know is also largely luck-driven.

Baseball Prospectus 2010