Hi Ragia, I can't make out your data or desired result, but it sounds like aggregate() might get you started. If you need more help, please repost your data using dput() and do NOT post in HTML so that we can see what your desired result looks like.
Sarah On Fri, Sep 4, 2015 at 10:12 AM, Ragia Ibrahim <ragi...@hotmail.com> wrote: > Dear Group,kinldy, I have the following data frame df > id value1 1 4 2 1 4 3 1 6 4 > 1 6 5 2 1.5 6 2 2.5 7 2 2.5 > 8 2 2.5 > > add rank column regarding id coulmn where rank for the highest value would be > 1, others rank would be the (value/ value of heighest)/ number of rows that > took the same value > thus the data frame should be > id value Rank1 1 4 > 0.332 1 4 0.333 1 6 > 0.54 1 6 0.55 2 1.5 > 0.6 6 2 2.5 0.337 2 2.5 > 0.338 2 2.5 0.33 > > how to reach this resultthanks in advanceRagia > [[alternative HTML version deleted]] > -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
