Population pyramid plot with ggplot2 and dplyr (instead of plyr)

Question

I am trying to reproduce the simple population pyramid from the post Simpler population pyramid in ggplot2

using ggplot2 and dplyr (instead

Answer 1

You can avoid both dplyr and plyr when making population pyramids with recent versions of ggplot2.

If you have counts of the sizes of age-sex groups then use the answer here

If your data is at the individual level (as yours is) then use the following:

set.seed(321)
test <- data.frame(v=sample(1:20,1000,replace=T), g=c('M','F'))
head(test)
#    v g
# 1 20 M
# 2 19 F
# 3  5 M
# 4  6 F
# 5  8 M
# 6  7 F

library("ggplot2")
ggplot(data = test, aes(x = as.factor(v), fill = g)) + 
  geom_bar(data = subset(test, g == "F")) + 
  geom_bar(data = subset(test, g == "M"), 
           mapping = aes(y = - ..count.. ),
           position = "identity") +
  scale_y_continuous(labels = abs) +
  coord_flip()