Stats Glossary

Most of the stats discussed on this blog are either from or

Here are a few of the stats quite commonly mentioned:

  • WAR stands for Wins Above Replacement and is a measure of how many wins a player was worth as compared to a replacement-level player. The exact method of determining WAR is complex, and it differs between and Fangraphs. Commonly on this site, then, you may see the designations bWAR and fWAR if the numbers are drawn from one of those two particular web sites.
  • OPS is on-base percentage plus slugging percentage. OPS+ is a normalized version of OPS that takes into account both the league-wide average OPS as well as the player’s home ballpark. A value of 100 is considered league-average, while over 100 is better than average.
  • ERA+ is similar to OPS+ in that it has been normalized to the league-wide average ERA and the player’s ballpark. 100 is average, while over 100 is better than average.
Game Score (explanation taken from B-R page here):
  • This is a value created by Bill James that evaluates how good a pitcher’s start was.

    Start with 50 points. Add 1 point for each out recorded, (or 3 points per inning). Add 2 points for each inning completed after the 4th. Add 1 point for each strikeout. Subtract 2 points for each hit allowed. Subtract 4 points for each earned run allowed. Subtract 2 points for each unearned run allowed. Subtract 1 point for each walk.

Please add any requests in the comments below for more terms to be explained here.

14 thoughts on “Stats Glossary

  1. Kahuna Tuna

    Consider separating the entries with a hard return. Easier on the eyes. If you don’t want all that empty space, you could put a bullet at the beginning of each entry.

    Whatever you do, this glossary is a terrific idea!

  2. Toffer

    Why is HHS using the bWAR name rather than the more common rWAR name that gives proper credit to the creator rather than the distributor? I don’t remember even B-R referring to it as bWAR.

    1. Andy

      I’m not even aware of the history of that stat–can you provide a link? If I’m drawing numbers from B-R’s site, it seems appropriate to flag them with the ‘b’ to make it clear what the source is.

      1. Toffer

        I don’t think their is one page that I could link to that would explain the history of WAR, rWAR, etc. But I can say that for many years Rally hosted his own WAR database using his own formulas.

        He stopped updating this two years ago when B-R started hosting it. Actually I just found the link with the announcement. As you can see B-R is using Sean Smith’s (aka Rally) WAR data. Confirmation from Tango:

        Although I was surprised to see a bunch of results for bWAR baseball it was still only half of the google results for rWAR baseball.

        I guess ultimately either is appropriate and bWAR might be less confusing to newcomers since it’s always in reference to fWAR but I thought that it should be noted that rWAR was the original name, the more common name, gives proper credit to the creator and is used more by “insiders”/writers.

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