[R] Add a column to a data frame with value based on the percentile of the row

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Hi all,

I think this should be an easy question for the guru's out here.

I have this large data frame (2.500.000 rows, 15 columns) and I want to add
a column named "SEGMENT" to it.
The first 5% rows (first 125.000 rows) should have the value "Top 5%" in the
SEGMENT column
Then the rows from 5% to 20% should have the value "5 to 20"
Then 20-50% should have the value "20 to 50"
And the last 50% of the rows should have the value "Bottom 50"

What is the easiest way of doing this? I was thinking of using quantile but
then I should have some rownumber column.

Regards Derk



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