On Aug 3, 2009, at 9:24 AM, Rnewbie wrote:
Dear all,
I have a dataset, and I wanted to merge the rows with duplicated IDs
by
calculating the means or medians from the duplicate rows. I tried
using the
command duplicated(x), but it only tells where the duplicated rows
are.
You might want to look at the ave function. It will calculate a
function within IDs and you can assign that as another row in the
datafrme before you exclude the duplicates.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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