stacked bars within grouped bar chart

Question

I have the following graph

test <- expand.grid(\'cat\' = LETTERS[1:5], \'cond\'= c(F,T), \'year\' = 2001:2005)
test$value <- floor((rnorm(nrow(test)))*         


        

Answer 1

You can put cat on the x-axis and use facet_grid with year:

ggplot() +
  geom_bar(data=test, aes(y = value, x = cat, fill = cond), stat="identity",
           position='stack') +
  theme_bw() + 
  facet_grid( ~ year)