plyr (version 1.5.1)

Baseball batting: Yearly batting records for all major league baseball players

Description

This data frame contains batting statistics for a subset of players collected from http://www.baseball-databank.org/. There are a total of 21,699 records, covering 1,228 players from 1871 to 2007. Only players with more 15 seasons of play are included.

Variables:

• id, unique player id
• year, year of data
• stint
• team, team played for
• lg, league
• g, number of games
• ab, number of times at bat
• r, number of runs
• h, hits, times reached base because of a batted, fair ball without error by the defense
• X2b, hits on which the batter reached second base safely
• X3b, hits on which the batter reached third base safely
• hr, number of home runs
• rbi, runs batted in
• sb, stolen bases
• cs, caught stealing
• bb, base on balls (walk)
• so, strike outs
• ibb, intentional base on balls
• hbp, hits by pitch
• sh, sacrifice hits
• sf, sacrifice flies
• gidp, ground into double play

Usage

data(baseball)

format

A 21699 x 22 data frame

References

http://www.baseball-databank.org/

Examples

baberuth <- subset(baseball, id == "ruthba01")
baberuth$cyear <- baberuth$year - min(baberuth$year) + 1

calculate_cyear <- function(df) {
  mutate(df, 
    cyear = year - min(year),
    cpercent = cyear / (max(year) - min(year))
  )
}

baseball <- ddply(baseball, .(id), calculate_cyear)
baseball <- subset(baseball, ab >= 25)

model <- function(df) {
  lm(rbi / ab ~ cyear, data=df)
}
model(baberuth)
models <- dlply(baseball, .(id), model)