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PirateGrunt/gist:5767596

Created June 12, 2013 17:56
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Example of how the dollar sign reference in a dataframe doesn't require the whole name.
Raw
gistfile1.txt
myData = data.frame(State = c("NY","NY", "TX", "TX")
, Premium = c(100,200,150,75)
, Loss = c(80,175,80,80))
myData
moreData = data.frame(Premium = myData$P, Loss = myData$L)
moreData
rm(moreData)
colNames = c("Premium", "Loss")
moreData = myData[,colNames]
moreData
rm(moreData)
library(doBy)
totalDf = summaryBy(Premium + Loss ~ State, data = myData, FUN=sum)
totalDf
moreData = data.frame(Premium = totalDf$P, Loss = totalDf$L)
moreData
rm(moreData)
colNames = c("Premium", "Loss")
moreData = totalDf[,colNames]
moreData
rm(moreData)
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