This page contains all the various Defensive Runs (DR) files I have
generated. DR is a way of calculating how many runs above average a given
Major League Baseball player is worth, defensively. It uses Sherri
Average (DA) numbers and Palmer and Thorn's Linear Weights to value
Here is a description of the DR method (plus
the meaning of some of the header abbreviations in the long forms),and here
are some comments and qualifications I have
about the DRs.
Many of the data files which follow have not been put into HTML format yet
and are just regular ASCII text files. However, you can use simple UNIX
tools like grep and sort to do useful formatting - for example, putting
together a list of all CFs ordered by average DR/G - which is nice when you
are writing an email or rec.sports.baseball article.
These are the important final quantities created by this analysis.
Remember that these are runs allowed, so negative numbers
indicate better than average fielding:
The player names are given as "first_initial. lastname". This causes a
problem for John and Jose Valentin, since they play the same position. So
I have changed Jose's first initial to "X" in these files; I figure John
was here first and has seniority.
- DR/G - defensive runs allowed above average per full
game played, assuming an average number of opps of average difficulty.
- TDR - defensive runs allowed above average for the
whole year; this takes into account opportunities and playing time.
These files contain just the Defensive Runs information for every player
from 1988 to 1995. They are ordered by position, player, and year.
These files contain DA, DR, and auxilliary information, such as the number
of extra base hits allowed or double plays made above average, pro-rated
to a full season. There are also statistics for regular players and
extras. Each year and league has its own file; players are ordered by
position and then DA.
- American League: 1988, 1989,
- National League: 1988, 1989,
Mean DR over many seasons
These files list Defensive Runs per game for each season, plus an average
DR/G over that player's career (since 1988), and an average Total Defensive
Runs for a typical full season given that average DR/G. (I assume that a
full season is 150 games played, so the column is just 150 times the
column). Combining many seasons in this way cuts down the error
from sample size, and helps balance out some biases due to pitchers or
neighboring fielders. The players are ordered by position, DR/G, and name.
(If your newsreader can't handle tables, or if you want simple ASCII files
to do greps and sorts with, click here:
Unfortunately, these files are more than 80 columns wide, but I couldn't
compress eight seasons worth DA data any further).
December 2, 1997