Message-ID: <82ba77b80809261354q47c21a64rb6ee185e28e6339a@mail.gmail.com>
Date: 2008-09-26T20:54:58Z
From: Matthew Pettis
Subject: Newbie: Ranking a data frame, grouped by 2 or more columns
Hi,
I'd like to rank obs in a data frame as subset by 2 or more columns...
The example input would look like the following:
====+====+====+====+
x y v
-- -- --
a w 200
a w 100
b w 500
b w 200
b z 300
b z 400
====+====+====+====+
And the data frame I want to create is below:
====+====+====+====+
x y v rank
-- -- -- ----
a w 200 1
a w 100 2
b w 500 1
b w 200 2
b z 300 2
b z 400 1
====+====+====+====+
Can someone help me with this?
Thanks,
Matt
--
It is from the wellspring of our despair and the places that we are
broken that we come to repair the world.
-- Murray Waas