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Calculate of data frame
2 messages · Zhang, Fan, Peter Dalgaard
"Zhang, Fan" <fzhang at doubleclick.net> writes:
Now I want to get the total count and value for each model/date pair, like model count value date A 6 31.8 7/1/2005 A 3 10.2 7/2/2005 B 7 14.2 7/1/2005 B 10 67.4 7/2/2005 Anyone can tell me how to do this?
aggregate(df[,c("count","value")],df[,c("date","model")],sum)
date model count value 1 7/1/2005 A 6 31.8 2 7/2/2005 A 3 10.2 3 7/1/2005 B 7 14.2 4 7/2/2005 B 10 71.4
O__ ---- Peter Dalgaard ??ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907