[R] Dealing with Duplicates - How to count instances?

[jim holtman]

table(data[column])

will give you the number of items in each subgroup; that would be the
count you are after.

On 2/2/07, Johannes Graumann <johannes_graumann at web.de> wrote:
> Hi there,
>
> given a data.frame 'data' I managed to filter out entries (rows) that are
> identical with respect to one column like so:
>
> duplicity <- duplicated(data[column])
> data_unique <- subset(data,duplicity!=TRUE)
>
> But I'm trying to extract how many duplicates each of the remaining rows
> had.
>
> Can someone please send me down the right path for this?
>
> Joh
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?