Michael Street Michael Street - 1 month ago 25
R Question

Adding labels to ggplot bar chart

I would like to do a bar plot outlined in black with percentages inside the bars. Is this possible from qplot? I get the percentages to appear but they don't align with the particular bars.

packages: ggplot2, reshape

created in Illustrator

x <- data.frame(filename = c("file1", "file2", "file3", "file4"),
low = c(-.05,.06,.07,-.14),
hi = c(.87,.98,.56,.79))
x$tot <- x$hi + x$low

x <- melt(x, id = 'filename')

bar <- qplot(x = factor(filename),
y = value*100,
fill = factor(variable),
data = x,
geom = 'bar',
position = 'dodge') + coord_flip()
bar <- bar + scale_fill_manual(name = '',
labels = c('low',
'Hi',
"Tot"),
values = c('#40E0D0',
'#FF6347',
"#C7C7C7"))
bar <- bar + geom_text(aes(label = value*100))+geom_bar(colour = 'black')
bar <- bar + opts(panel.background = theme_rect(colour = NA))
bar <- bar + opts(legend.justification = 'bottom')
print(bar)

Answer

Here you go:

library(scales)
ggplot(x, aes(x = filename, fill = variable)) +
  geom_bar(stat="identity", ymin=0, aes(y=value, ymax=value), position="dodge") +
  geom_text(aes(x=filename, y=value, ymax=value, label=value, 
                hjust=ifelse(sign(value)>0, 1, 0)), 
            position = position_dodge(width=1)) +
  scale_y_continuous(labels = percent_format()) +
  coord_flip()

enter image description here