Hello,
Simple question that I am stuck on and can't seem to find an answer in the
help files currently. I have a list which contains repeated ID's. I would
like to have R count the number of ID's. For example:
ID=c(1,1,1,1,2,2,2,2,3,3,3,3)
as.data.frame(ID)
Clearly, there are 3 groups. How would I have R give me the summary:
ID
3
Many thanks,
Charles
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