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11460001
2007 Jul 05
3
summarizing dataframe at variable/factor levels
All,
Is there an efficient way to apply say "mean" or "median" to a dataframe
according to say all combinations of two variables in the dataframe?
Below is a simple example and the outline of a "manual" solution that
will work but is not very efficient
(could also generalize this to a function). Searched the archives and
docs but didn't see anything close to