How to add rows with 0 counts to summarised output

Question

I have added sample data below, I have used dplyr to count on Rco and month:

structure(list(Rco = structure(c(1L, 1L, 1L, 1L, 2L, 2         


        

Answer 1

You can use tidyr::complete and specify the fill to be 0 (instead of the default NA):

library(tidyr)
complete(df, Rco, month, fill = list(count = 0))