How to label a barplot bar with positive and negative bars with ggplot2

Question

I\'m trying to plot a labeled barplot with ggplot2 with positive and negative bars. That works so far, but I would

Answer 1

This does the trick

library(plyr)
library(ggplot2)
library(scales)
dtf <- data.frame(x = c("ETB", "PMA", "PER", "KON", "TRA", 
                  "DDR", "BUM", "MAT", "HED", "EXP"),
                  y = c(.02, .11, -.01, -.03, -.03, .02, .1, -.01, -.02, 0.06))
ggplot(dtf, aes(x, y)) +
  geom_bar(stat = "identity", aes(fill = x), legend = FALSE) + 
  geom_text(aes(label = paste(y * 100, "%"),
               vjust = ifelse(y >= 0, 0, 1))) +
  scale_y_continuous("Anteil in Prozent", labels = percent_format()) +
  opts(axis.title.x = theme_blank())