Good news everyone. tRA has made its way to FanGraphs thanks to Graham MacAree of Lookout Landing and statcorner.com. tRA is currently located in the player pages under the batted ball section of stats.
Directly from the StatCorner glossary:
tRA involves assigning run and out values to all events under a pitcher’s control and coming up with an expected number of runs allowed and outs generated in a defense and park neutral environment. tRA is on a R/9 scale and does not involve any regression of the rates.
There are a couple things which are different between the StatCorner version of tRA and the version implemented on FanGraphs. The main difference is we’re using Baseball Info Solutions batted ball stats instead of Gameday batted ball stats. The other difference, though probably not as major is we’re using different park factors.
tRA will not be available in the leaderboards or team pages until this winter most likely because it’s going to take a minor overhaul to the code in order to handle the park adjustments.
Graham will be stopping by later to give a better overview of the stat.