References/Notes/Attributions:
Source
M. Friendly (2000), Visualizing Categorical Data, pages 19–20.
References
D. C. Hoaglin \& J. W. Tukey (1985), Checking the shape of discrete distributions. In D. C. Hoaglin, F. Mosteller, J. W. Tukey (eds.), Exploring Data Tables, Trends and Shapes, chapter 9. John Wiley \& Sons, New York.
R. A. Jinkinson \& M. Slater (1981), Critical discussion of a graphical method for identifying discrete distributions, The Statistician, 30, 239–248.
M. Friendly (2000), Visualizing Categorical Data. SAS Institute, Cary, NC.