At 6:44 PM +0100 2/12/10, Søren Højsgaard wrote:
You might find the summaryBy function in the doBy package useful.
Regards
Søren
see also the describe.by function in the psych package.
________________________________________
Fra: [email protected]
[[email protected]] På vegne af
jose romero [[email protected]]
Sendt: 12. februar 2010 18:23
Til: [email protected]
Emne: [R] summary statistics for grouped data
Hello list:
Is there an easy way (preferably through one of
the standard R packages) of obtaining summary
statistics for grouped data? I could split the
data into classes by hist, and then
progressively calculate all the "columns" i need
to obtain the mean and standard deviation, but i
was looking for a single function that could do
that with a data vector.
Thanks in advance,
jose romero
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