This MLB offseason, while arguably a bit chilly by hot stove standards, did offer baseball fans a hot new hitting metric in Baseball Prospectus’ Deserved Runs Created Plus (DRC+). In the words of its creators, DRC+ is “designed to parse out more accurately . . . batters’ expected individual contributions — separate from all other player and environmental factors — to their teams’ offensive production.” (My summary of that introductory article, which was nominated for a SABR research award, can be found through here.)
Unlike traditional, rate-based hitting metrics such as batting average (BA) and on-base percentage (OBP), DRC+ is an index statistic, meaning that it’s arranged to indicate the degree to which a player is above or below average, where 100 represents average. As part of its DRC+ rollout, BP published an homage to rate statistics (link and summary available through here) that touts their simple approach to delivering contextual information.
This undoubtedly is a user advantage for metrics like DRC+, but, by placing the focus so squarely on the average reference point, the initial transition from the rate-stat world of BA/OBP/SLG to the index-stat world of DRC+ can be a little bit rough. To help smooth things, I thought it would be beneficial to illustrate the translation with a quick look at all of the hitters who had “average,” according to DRC+, seasons at the plate in 2018.
Last season, eleven batters finished with at least 275 plate appearances and DRC+ marks of 100. As their traditional slash lines illustrate, they got to that point in a variety of ways.
The ranges for these eleven on each of the traditional hitting rate statistics are:
- BA: .224 – .280
- OBP: .294 – .351
- SLG: .359 – .484
Obviously, because of the multitude of factors DRC+ considers, including both player-performance factors and environmental factors, these rate bands only serve as rough guidelines for fans making the mental shift from the rate world of BA/OBP to DRC+ that want a little help finding their bearings. (Also keep in mind that these “average” slash-line bands will vary from year to year. For example, in 1998, there were four players with at least 275 PA who posted DRC+ marks of 100, Matt Williams, Devon White, Luis Alicea, and Robin Ventura: BA between .263 and .279; OBP between .327 and .372; and SLG between .425 and .456. For reference, Mark McGwire, .299/.470/.752, led MLB with a DRC+ of 211 that year.)