Dear Leon,
Perhaps:

x <- c("yes", "no", "yes", "yes", "no", "not sure")
names(table(x))[table(x)>=2]


HTH,


Jorge


On Wed, Oct 29, 2008 at 9:47 AM, Leon Yee <[EMAIL PROTECTED]> wrote:

> Dear all,
>
>    How can I get the duplicated elements from a vector? For example,
> x <- c("yes", "no", "yes", "yes", "no", "not sure"), how can I filter out
> all the elements which occured >=2 times?
>
>    Thanks for any help!
>
> Regards,
> Leon
>
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