The purpose of this posting is to provide a handy reference source of frequently used "new-age" statistical data for posters. This source will provide a definition of the term and will provide an online source for the data.
Stats appearing here are ones that are referenced by posters at this website. It is not intended to be an all-encompassing resource of all the sabermetric data currently available, but rather a reference source to help board members as they engage in discussions where these stats are referenced.
EqA (Equivalent Average). A measure of total offensive value per out, with corrections for league offensive level, home park, and team pitching. EQA considers batting as well as baserunning, but not the value of a position player's defense. The EqA adjusted for all-time also has a correction for league difficulty. The scale is deliberately set to approximate that of batting average. League average EqA is always equal to .260. EqA is derived from Raw EqA, which is (H + TB + 1.5*(BB + HBP + SB) + SH + SF) divided by (AB + BB + HBP + SH + SF + CS + SB). REqA is then normalized to account for league difficulty and scale to create EqA.
EqA data are available at Baseball Prospectus.
OPS+ is OPS (On-Base Percentage + Slugging Percentage) normalized for both the park and the league the player played in and is expressed as an index where 100 is average, anything over 100 is above average and anything under is below average. Think of it as a rate above the league average expressed as a percentage.
OPS+ data are available on individual player pages and team pages at Baseball-Reference.com
WARP (Wins Above Replacement Player). The number of wins this player contributed, above what a replacement level hitter, fielder, and pitcher would have done. When expressed as WARP-1 adjustments are made only for within the season. WARP-2 adds difficulty into the mix. One of the factors that goes into league difficulty is whether or not the league uses a DH, which is why recent AL players tend to get a larger boost than their NL counterparts. WARP-3 further adjusts by expanding to 162 games to compensate for shortened seasons. Pitchers are treated differently, looking not only at season length, but the typical number of innings thrown by a top starting pitcher that year (defined by the average IP of the top five in IP).
WARP-1 data are available on individual player pages at baseballprospectus.com
WPA (Win Probability Added) The Win Probability for a specific situation in baseball (including the inning, number of outs, men on base, and score) is obtained by first finding all the teams that have encountered this situation. Then the winning percentage of these teams in these situations is found. Win Probability Added, thus, is the difference between the Win Probability when the player came to bat and the Win Probability when the play ended.
WPA data are available at Fangraphs.
Those interested in calculating the WPA for an individual play on their own can do so with the aid of this site.
