Hello,
Try the following.
dat <- read.csv(text = "
Regime, Industry, Cost
10, 01, 370
11, 01, 400
10, 02, 200
10, 01, 500
11, 02, 60
10, 02, 30
")
dat
res <- aggregate(Cost ~ Industry + Regime, data = dat, sum)
res <- res[order(res$Industry), ]
res
And see the help page ?aggregate
Hope this helps,
Rui Barradas
Quoting Paolo Letizia <paolo.leti...@gmail.com>:
Dear All:
I have a data frame with 3 columns: "Regime", "Industry", and "Cost".
I want to sum the value of "Cost" for each industry and "Regime".
Example:
The data frame is:
Regime, Industry, Cost
10, 01, 370
11, 01, 400
10, 02, 200
10, 01, 500
11, 02, 60
10, 02, 30
I want the following output:
01, 10, 870
01, 11, 400
02, 10, 230
02, 11, 600
Can you please help me on this? Paolo
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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