Given two ordered factors in a square, n x n frequency table, Crossings
creates an n-1 column matrix corresponding to different degrees of difficulty
in crossing from one level to the next, as described by Goodman (1972).
Usage
Crossings(...)
Arguments
...
Two factors
Value
For two factors of n levels, returns a binary indicator matrix
of n*n rows and n-1 columns.
Author(s)
Michael Friendly and Heather Turner
References
Goodman, L. (1972). Some multiplicative models for the analysis of cross-classified data.
In: Proceedings of the Sixth Berkeley Symposium on Mathematical Statistics and Probability,
Berkeley, CA: University of California Press, pp. 649-696.
See Also
glm,
gnm for model fitting functions for frequency tables
Diag,
Mult,
Symm,
Topo
for similar extensions to terms in model formulas.