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Computing with Data

elgeish
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The Split-Apply-Combine Framework

# Example 1 - the ddply function
library(plyr)
head(baseball)
# Count number of players recorded for each year
bbPerYear = ddply(baseball, "year", "nrow")
head(bbPerYear)
qplot(x = year,
y = nrow,
data = bbPerYear,
geom = "line",
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