Showing data values on stacked bar chart in ggplot2

by

From ggplot 2.2.0 labels can easily be stacked by using position = position_stack(vjust = 0.5) in geom_text.

ggplot(Data, aes(x = Year, y = Frequency, fill = Category, label = Frequency)) +
  geom_bar(stat = "identity") +
  geom_text(size = 3, position = position_stack(vjust = 0.5))

enter image description here

Also note that “position_stack() and position_fill() now stack values in the reverse order of the grouping, which makes the default stack order match the legend.”

Answer valid for older versions of ggplot:

Here is one approach, which calculates the midpoints of the bars.

library(ggplot2)
library(plyr)

# calculate midpoints of bars (simplified using comment by @DWin)
Data <- ddply(Data, .(Year), 
   transform, pos = cumsum(Frequency) - (0.5 * Frequency)
)

# library(dplyr) ## If using dplyr... 
# Data <- group_by(Data,Year) %>%
#    mutate(pos = cumsum(Frequency) - (0.5 * Frequency))

# plot bars and add text
p <- ggplot(Data, aes(x = Year, y = Frequency)) +
     geom_bar(aes(fill = Category), stat="identity") +
     geom_text(aes(label = Frequency, y = pos), size = 3)

Resultant chart

More Related Contents:

  1. How to use Greek symbols in ggplot2?
  2. How do you order the fill-colours within ggplot2 geom_bar
  3. It is possible to create inset graphs?
  4. How to make graphics with transparent background in R using ggplot2?
  5. Reproducing lattice dendrogram graph with ggplot2
  6. How to shade a region under a curve using ggplot2
  7. Remove facet_wrap labels completely
  8. ggplot Donut chart
  9. Coloring boxplot outlier points in ggplot2?
  10. Plotting pca biplot with ggplot2
  11. Reorder bars in geom_bar ggplot2 by value
  12. Rotating and spacing axis labels in ggplot2
  13. Looping over variables in ggplot
  14. Customize axis labels
  15. Bar plot with log scales
  16. Animated sorted bar chart with bars overtaking each other
  17. Creating grouped bar-plot of multi-column data in R
  18. Displaying a greater than or equal sign
  19. How to change order of boxplots when using ggplot2?
  20. R package lattice won’t plot if run using source()
  21. Modifying fonts in ggplot2
  22. How to fill with different colors between two lines? (originally: fill geom_polygon with different colors above and below y = 0 (or any other value)?)
  23. ggplot geom_point() with colors based on specific, discrete values
  24. GGplot custom scale transformation with custom ticks
  25. Plotting multiple graphs in R [closed]
  26. Changing format of some axis labels in ggplot2 according to condition [duplicate]
  27. Spacing between boxplots in ggplot2
  28. Add axis tick-marks on top and to the right to a ggplot?
  29. Creating a vertical color gradient for a geom_bar plot
  30. heatmap-like plot, but for categorical variables

Leave a Comment