References/Notes/Attributions:
Source
M. Friendly (2000), Visualizing Categorical Data, page 91.
References
A. Agresti (1990), Categorical Data Analysis. Wiley-Interscience, New York.
M. Hout, O. D. Duncan, M. E. Sobel (1987), Association and heterogeneity: Structural models of similarities and differences, Sociological Methodology, 17, 145-184.
M. Friendly (2000), Visualizing Categorical Data. SAS Institute, Cary, NC.