Does anyone have an example of how to render a forest plot using JFreeChart (or another Java-based open source charting library, but JFreeChart is preferred due to the integration with Jasper Reports)?
See https://en.wikipedia.org/wiki/Forest_plot for description of the forest plot.
I was thinking about hacking somethign together using a horizontal bar chart where left side of the axis is the categorical value, and right side is the range, but the problem is the data for a forest plot comes in a set of data like: category, min, max. Such as an odd ratio with a confidence interval that spans between -.1 to 1.2. The forrest plot would basically be a line drawn between -.1 and 1.2 with a diamond marker directly in the middle (around .55).
If anyone has experience on building this visualization in JFreeChart, it would be much appreciated!
While this is not supported directly in the current release, a reasonable facsimile should be possible. Instead of a bar chart, consider using a MinMaxCategoryRenderer
having PlotOrientation.HORIZONTAL
and custom icons, as shown here. Add a CategoryMarker
or CategoryLineAnnotation
with a dashed Stroke
to the CategoryPlot
for the centerline; add a CategoryItemLabelGenerator
to handle the labels.