Glossary:
NB: All averages presented are MLB league averages.
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For 2007 onwards, the data is taken from Major League Baseball's play-by-play files.
tRA
The basic introduction to tRA is located here. 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.
The basic introduction to tRA is located here. 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.
tRAr
This is tRA, but regressed using the player's past results as a baseline and the league averages when a large enough sample is unavailable. More details to come.
This is tRA, but regressed using the player's past results as a baseline and the league averages when a large enough sample is unavailable. More details to come.
wOBA
wOBA or weighted on base average is a statistic developed by and used with the permission of Tom Tango. He gives a detailed rundown of it here. In a nutshell, wOBA uses linear weights on certain batting events to come up with a metric that is scaled onto an OBP scale.
wOBA or weighted on base average is a statistic developed by and used with the permission of Tom Tango. He gives a detailed rundown of it here. In a nutshell, wOBA uses linear weights on certain batting events to come up with a metric that is scaled onto an OBP scale.
wOBAr
This is wOBA, but with the hitter's success on batted balls regressed toward his prior averages. League averages are used when the sample size is too small. In effeft, it's PrOPS, but with a player's past history used as the baseline when possible instead of the league. More details to come.
This is wOBA, but with the hitter's success on batted balls regressed toward his prior averages. League averages are used when the sample size is too small. In effeft, it's PrOPS, but with a player's past history used as the baseline when possible instead of the league. More details to come.
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