NAME: Barry Bonds' 2002 Plate Appearances
TYPE: Census 
SIZE: 588 observations, 8 variables

DESCRIPTIVE ABSTRACT: 
Data are provided for Barry Bonds' plate appearances in the 2002
baseball season.  Variables include characteristics of the innings
before the first pitch to Bonds (e.g., the number of outs, the number
of runners on each base, the opposing pitcher's earned run average) 
and after the first pitch to Bonds (e.g., the outcome of the
appearance, how many runs scored in the inning after Bonds hits).

SOURCES:
The data were obtained from CBS Sportsline at
http://www.cbs.sportsline.com.  This site has pitch-by-pitch summaries
of every baseball game in 2002. 

Pitchers' ERAs were obtained from ESPN at http://www.espn.com.

These data were analyzed in Reiter, J. P. (2002) "Should teams walk or pitch to
Barry Bonds?"  By the Numbers: The Newsletter of the SABR Statistical
Analysis Committee, 12 (November 2002), pp. 7-11.

VARIABLE DESCRIPTIONS:
Each plate appearance is on a single line of a text file with line breaks. 
Values are delimited by spaces.  Note that there are different
variables in the 2002 dataset than in bonds2001.dat.

Columns         Description
 
   1           Equals one when there is a runner on first base when
	       Bonds appears and equals zero otherwise. 

   4           Equals one when there is a runner on second base when
	       Bonds appears and equals zero otherwise. 

   7           Equals one when there is a runner on third base when 
	       Bonds appears and equals zero otherwise. 

   10          Number of outs in inning when Bonds appears.

   13          Equals zero if Bonds does not reach base.
	       Equals one if Bonds reaches first base on a single or
	       error. Equals two if Bonds reaches second base on a double or
	       error. Equals three if Bonds reaches third base on a triple or
	       error. Equals four if Bonds hits a home run. Equals
	       five if Bonds walks or is hit by a pitch. 
   
   16           Number of runs scored by Giants in the inning after first pitch to Bonds.


 19-22          Opposing pitchers' career earned run average as of the
		end of the 2001 season.

 25-26          Initials of player batting immediately after Bonds:
			JK = Jeff Kent
			BS = Benito Santiago
			RS = Reggie Sanders
			RA = Rich Aurelia
			YT = Yorvit Torrealba
			DB = David Bell
			SD = Shawn Dunston
			RM = Ramon Martinez
			NA = missing

   29		Player batting immediately after Bonds (previous column numerically coded): 
			0 = missing
			1 = Jeff Kent
			2 = Benito Santiago
			3 = Reggie Sanders
			4 = Rich Aurelia
			5 = Yorvit Torrealba
			6 = David Bell
			7 = Shawn Dunston
			8 = Ramon Martinez


NOTES: 
There are a few games for which data were not available, due to
invalid web links. These missing data should not bias analyses, since
they are missing completely at random.  The at bats are in order of 
appearance within the same game, but they are not in order of
appearance by game date.

For rookie pitchers, I used their 2002 earned run average. 

STORY BEHIND THE DATA: 
These data, along with data from the 2001 season, were used to analyze whether
walking rather than pitching to Bonds reduces the chance that the Giants will 
score runs.

PEDAGOGICAL NOTES:
See the document bonds2001.txt for pedagogical notes.


SUBMITTED BY:
Jerome P. Reiter
Institute of Statistics and Decision Sciences
Duke University
Box 90251
Durham, NC 27708
jerry@stat.duke.edu