References/Notes/Attributions:
Source
Michael Friendly (2000), Visualizing Categorical Data, pages 82–83, 319–322.
References
A. Agresti (1990), Categorical Data Analysis. Wiley-Interscience, New York, Table 7.11, p. 237
J. R. Ashford and R. D. Sowdon (1970), Multivariate probit analysis, Biometrics, 26, 535–546.
M. Friendly (2000), Visualizing Categorical Data. SAS Institute, Cary, NC.