You might find the summaryBy function in the doBy package useful.
Regards
Søren
________________________________________
Fra: r-help-boun...@r-project.org [r-help-boun...@r-project.org] På vegne
af jose romero [jlauren...@yahoo.com]
Sendt: 12. februar 2010 18:23
Til: r-help@r-project.org
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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