Calculate percentages of a binary variable BY another variable in R

Question

I want to summarise the percentage of people that have been treated BY region.

I have created a dummy dataset for this purpose:

id <- seq(1:1000)
         


        

Answer 1

If I understand the question correctly, this can be very easily (and fast!) done with table and prop.table:

prop.table(table(d$treatment, d$region))

This gives you the percentages of each cell. If you want to get row- or column-wise percentages, you want to make use of the margin parameter in prop.table:

prop.table(table(d$treatment, d$region), margin = 2) # column-wise
prop.table(table(d$treatment, d$region), margin = 1) # row-wise