Hi, i have group all the data, but now if i would want to sum all the rank in each group, how can i do it? ie. i want to sum the rank in every group, not total. so there will be a sum of rank for month Jan,Feb,.....Dec, therefore there will be total of 12 vaule of ranking sum. many thanks, -- View this message in context: http://www.nabble.com/grouping-data-together-tp20389726p20410781.html Sent from the R help mailing list archive at Nabble.com.
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