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Dear R-help, Please can someone explain how to put a column name on an output data.frame. ##Starting with a data.frame with 3 columns (d$Year, d$NoIndiv, d$wtd_tl) yr_ind <- split (d$NoIndiv, d$Year) yr_tl <- split (d$wtd_tl, d$Year) ann_ind <- sapply (yr_ind, sum) ann_tl <- sapply (yr_tl, sum) av_tl <- ann_tl/ann_ind d2<- data.frame (av_tl) ##This gives me a data.frame

I have a data frame that I plan on importing from a file (there are other columns of numeric data): > xy x y 1 1 1 2 1 1 3 1 1 4 1 1 5 2 2 6 2 2 7 2 2 8 2 2 > where x is a column of factors, and y is a column of factors, that have different levels, e.g., > x [1] low low low low hi hi hi hi Levels: low hi > y [1] med med med med medhi medhi medhi medhi Levels: med