plyr (version 1.8.9)

baseball: 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.

Usage

baseball

Format

A 21699 x 22 data frame

Variables

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

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)