References/Notes/Attributions:
Source
Michael Friendly (2000), Visualizing Categorical Data, page 19.
References
F. Mosteller & D. L. Wallace (1984), Applied Bayesian and Classical Inference: The Case of the Federalist Papers. Springer-Verlag, New York, NY.
M. Friendly (2000), Visualizing Categorical Data. SAS Institute, Cary, NC.