Chapter 3: Descriptive Statistics

Code for examples
Featured graph
Web appendix by chapter
Color and graphics:
  •  ColorBrewer.  Dr Cindy Brewer, of  Penn State University, has developed these color schemes for the Digital Government: Quality Graphics project.  They include very useful information on visibility for the color-blind, suitability for photocopying, for cheap color printers, and for digital projection.
  • Vischeck has tools to evaluate images for visibility with red-green color-blindness, and to modify images to improve visibility.
  • has many articles on the use of color on screen and on paper.
Histogram bin width:
  • This applet shows the effect of varying the bin width in a histogram.