> table(paste(dat$A,dat$B))
JFRI (Jesper Frickmann) wrote:
I want a list of the number of times some factor levels appear together, similar to the following SQL statement:
SELECT A, B, COUNT(C) FROM TBL GROUP BY A, B
How do I do that with a data.frame in R?
Thanks, Jesper Frickmann Statistician, Quality Control Novozymes North America Inc. 77 Perry Chapel Church Road Franklinton, NC 27525 USA Tel. +1 919 494 3266
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