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...ferent groups such as Group1 is obs 1-10 Group 2 is obs-11-20 and so on. First step is to subset them into the 10 groups, then calculate the mean of var1 for each of the 10 groups. Any help would be appreciated. Thanks. _________________________________________________________________ sh_skydrive_062008 [[alternative HTML version deleted]]

Dear R Users, A bit of an elementary question, but somehow, I haven't been able to figure it out. I'd like to changes the column names of a data frame, so I am looking for something like col.names (as in row.names). Could someone please show me how to change the column names of a data frame ? Thanks, Tolga Generally, this communication is for informational purposes only and it is

I want to take the first row of each unique ID value from a data frame. For instance > ddTable <- data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry")) I want a dataset that is Id Name 1 Paul 2 Bob > unique(ddTable) Will give me all 4 rows, and > unique(ddTable$Id) Will give me c(1,2), but not accompanied by the name column.