On Fri, 15 Mar 2019 03:06:28 +0800
roslinazairimah zakaria <roslina...@gmail.com> wrote:

> how many of ATTRIBUTE related to TRAITS.

The table() function can be used to count occurrences of each
combination of factor levels. Does extracting the two columns by
dd[,c('ATTRIBUTE','TRAIT')] and passing the result to table() help?

-- 
Best regards,
Ivan

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