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Miscellaneous League Stats

These are just assorted little facts about the teams in the league.

Tm - Team ID (see A list of ID's)
E - Errors committed in the field
DP - Double Plays in the field
FP% - Team Fielding Percentage
DefEff - Defensive Efficiency. This is a Bill James measure that estimates the number of batted balls turned into outs by a team. The estimate for plays made is based on outs minus things like double plays, caught stealings and outfield assists or total batters faced minus strikeouts, walks, HBP, Hits and errors times a factor. These aren't perfectly known historically, so some of these ratings may be dubious.
Attendance - Attendance for that team's home games
Att/G - Approximate Attendance/Home Game (I just divided total games by two to estimate home games.)
pW-pL - Pythagorean Win-Loss Record
BPF - Batting Park Factor
PPF - Pitching Park Factor
AgeB - Average Age of Batters (Explained Below)
AgeP - Average Age of Pitchers (Explained Below)
HOF - Number of Hall of Famers who played for the team for at least one game. Please note that some of these players may have been Hall of Famers for things other than playing (like Branch Rickey).
AS - All-Stars on the team for that season. This counts the players on the All-Star game roster representing this team.
aAS - All-Time All-Stars on the team for that season. This is the number of players on the roster that have ever appeared in an All-Star game. Note that this occurrence may have been in later seasons than the one you are looking at.
Managers - You know who they are. Multiple managers are listed in the order they worked for the team.

Team Batting and Pitching Ages

The pitching team ages are a bit complicated to compute, so I'll start with the batting ages. For batting, I just used the weighted average of the ages of each player on the roster. The age was weighted by the player's at bats + games. This gives a bit of a boost to widely used bench players.

For pitching age, I weighted the ages by 3 * GS + G + SV, so a starter's results will be weighted by 130 or so, a good reliever by 60 and a closer by 90 or so. I like the values this gives to various members of the pitching staff.

For further questions or comments, send us a note.

Stats updated through October 12, 2008.

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