There are a few things we know with reasonable certainty about Robbie Ray. He was born on October 1, 1991 just south of Nashville in Brentwood, Tennessee. In 2010, the Washington Nationals drafted him in the twelfth round of the amateur draft. The Nationals traded him, along with two other players, to the Detroit Tigers in 2013 in exchange for Doug Fister. A year later, the Tigers traded him to the Arizona Diamondbacks as part of a three-team trade that netted the Tigers Shane Green and the New York Yankees Didi Gregorius. So far, Ray has seen major-league action as a starting pitcher with the Tigers and Diamondbacks. He showed promise in his first three appearances (two starts and an inning of relief), for Detroit. He showed less promise in his remaining six appearances– four starts and two relief innings– for that team. Things have ticked back up for Ray since his arrival in the desert, however.

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Most baseball fans likely have some familiarity with the player-valuation concept of wins above replacement player, usually labeled WAR. What many fans may not realize, however, is that there actually are three different versions of the WAR statistic. The goal of each version is the same: to determine a comprehensive valuation of an individual baseball player. Each takes slightly different paths to reach that comprehensive valuation, but they typically reach similar conclusions about a given player, such that it’s common to see or hear a player’s WAR cited without specific reference to the particular version utilized.

For example, the three versions– Baseball-Reference’s WAR (“rWAR”), FanGraphs’ WAR (“fWAR”), and Baseball Prospectus’ WARP (“WARP”)– all agree that Mike Trout had a great 2016. He finished the season with 10.6 rWAR, 9.4 fWAR, and 8.7 WARP, good for first, first, and second by each metric, respectively. For another example, they also agree about Trout’s former MVP nemesis, Miguel Cabrera: 4.9 rWAR, 4.9 fWAR, 3.9 WARP. (In my anecdotal experience, WARP tends to run a little lower than rWAR and fWAR for all players.)

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While the WAR varietals typically and generally concur, that isn’t always the case. Pitchers can be particularly susceptible to this variance, because the measurement of pitching performance is one of the areas in which the three metrics are most different. Continue reading →