Add a “rank” column to a data frame

Question

I have a dataframe with counts of different items, in different years:

df <- data.frame(item = rep(c(\'a\',\'b\',\'c\'), 3),
                 year = rep(c         


        

Answer 1

While using the answers given by others, I found that the following performs faster than the transform and dyplr variants:

df$year.rank <- ave(count, year, FUN = function(x) rank(-x, ties.method = "first"))