Created
August 30, 2013 11:47
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R Aggregating Data
It is relatively easy to collapse data in R using one or more BY variables and a defined function.
http://www.statmethods.net/management/aggregate.html
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| # aggregate data frame mtcars by cyl and vs, returning means | |
| # for numeric variables | |
| attach(mtcars) | |
| aggdata <-aggregate(mtcars, by=list(cyl,vs), | |
| FUN=mean, na.rm=TRUE) | |
| print(aggdata) | |
| detach(mtcars) |
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