On Wed, 5 Jan 2005 [EMAIL PROTECTED] wrote:
Dear list,
I have a dataset as follow and I would like to count the frequencies for the combination of the two variables (f1 and f2) for each id. I know it is should be straight forward, but I just don't know how to do it in R. Here is the SAS code I will use to get the output I want :
table() will count frequencies, and interaction() will create a variable with all combinations of a set of variables, so something like
table(interaction(f1,f2))
-thomas
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