aggregate/sum with ggplot
Is there a way to sum data with
I want to do a bubble map with the size depending of the sum of z.
Currently I'm doing something like
But I feel I'm writing the same thing twice, I would like to be able to write something
I had a look at
stat_summmary but I'm not sure they are appropriate either.
Is it possible to it with
ggplot2 ? If not, what would be best way to write those 2 lines.