|Season||Name||PA eRBI||AB eRBI||aRBI||ROLA||aeRatio|
|Season||Team||Battling Order Spot||eRBI|
With each player coming up to the plate over the course of a year, they will all have unique situations due to their spot in the lineup and surrounding teammates. Some players are faced with more opportunities to drive in runs than others, some RBI are driven in easier than other RBI, and some players just have more total at bats in general--so why should a player’s ability to drive in runs be measured by only a simple tally of the runners they cause to score? By creating the measure of Expected RBI, you are able to find how well a player drives in runs in relation to the situations that they were presented.
In order to do so, you need to calculate:
Using Retrosheet, all of the above data is available to calculate. Multiplying the outcome percentages with the RBI created percentages by the number of ABs in a given situation will give you a player’s expected RBI for that situation. Repeat for each situation for their total expected RBI that season.
Also using Retrosheet, you can find a players actual RBI in each of these situations during a season. Once a total actual RBI and expected RBI are found for a player, simply divide the actual RBI by expected RBI to get their aeRatio, or take the difference
Please refer to the links and the glossary for any further explanation. Also, I will be adding an expansion page as I include tips and enhancements in the future.
Represents how much RBI a league average player would have generated in a specific set of situations.
Represents the number of runners that a player drove in during an at bat, which eliminates RBIs accumulated on walks or errors in the field - sacrifice flies and groundouts are still included.
Represents opportunity that a player gets during a plate appearance that ends in an outcome that qualifies as an at-bat.
Represents opportunity that a player gets in every plate appearance, regardless of the outcome.
Represents opportunity that a spot in a team's batting order is given to drive in runs, regardless of the batter or the outcome of the plate appearance.
Represents the amount of actual RBI that a player earns per each expected RBI. A ratio above one shows a player drove in more runs than expected, while a ratio under one shows a player failed to drive in more runs than what the league average would be expected to.
Represents the variance between a player’s actual RBI and their expected RBI. A positive ROLA shows a player who drove in more runs than expected, while a negative ROLA shows a player failed to drive in more runs than what the league average would be expected to.
|0 out||1 out||2 out|