Glossary - Seamheads Negro Leagues Database


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Defensive Regression Analysis (DRA)

Counting Stats

G = Games
GS = Games Started
Inn = Innings
PO = Putouts
A = Assists
E = Errors
DP = Double Plays
PB = Passed Balls
WP = Wild Pitches
SB = Stolen Bases
CS = Caught Stealing

Rate Stats

Fld% = Fielding Percentage ((PO + A) / (PO + A + E))
RF = Range Factor = ((PO + A) * 9 / Inn)

Defensive Regressino Analysis (DRA)

DRA was created by Michael Humphreys and its method is described in the book Wizardry. He has provided the data for seasons from 1893-2009. The remaining years (1871-1892 & 2010-present) have been calculated by The Baseball Gauge.

DRA Categories


Total runs saved from all categories below.


Runs Saved from a fielder's range. Catchers are not included.


Total runs saved per 1000 innings.


Runs Saved from catcher's assists in the field, caught stealings, and stolen bases allowed.


Runs Saved from catchers avoiding passed balls.


Runs saved from outfield assists

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