group data
Hello, Try the following. dat <- read.table(text = " ID Value AL1 1 AL2 2 CA1 3 CA4 4 ", header = TRUE, stringsAsFactors = FALSE) dat$State <- substr(dat$ID, 1, 2) Note that this dependes on having State being defined by the first two characters of ID. Hope this helps, Rui Barradas Em 11-04-2013 19:37, Ye Lin escreveu:
Hey, I have a dataset and I want to identify the records by groups for further use in ggplot. Here is a sample data: ID Value AL1 1 AL2 2 CA1 3 CA4 4 I want to identify all the records that in the same state (AL1 AND A2), group them as "AL", and do the same for CA1 and CA4. How can I have an output like: ID Value State AL1 1 AL AL2 2 AL CA1 3 CA CA4 4 CA Thanks for your help! [[alternative HTML version deleted]]
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