Biostatistics: A Methodology for the Health Sciences (2nd Edition)

Gerald van Belle, Lloyd Fisher, Patrick J. Heagerty, Thomas Lumley

From time to time we will add a featured graphic, illustrating some interesting technique or dataset.  Here is the first one.

This image is the basis for the cover art. It shows the relationship between solar radiation and ozone concentrations (in New York in summer), stratified to remove the masking effects of wind and temperature. A simpler version is in Figure 3.7. The unstratified graph which gives quite a different impression, is Figure 3.9