Crossings: Crossings Interaction of Factors

In vcdExtra: 'vcd' Extensions and Additions

Description

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.

Examples

data(Hauser79)
# display table
structable(~Father+Son, data=Hauser79)

hauser.indep <- gnm(Freq ~ Father + Son, data=Hauser79, family=poisson)
hauser.CR <- update(hauser.indep, ~ . + Crossings(Father,Son))
LRstats(hauser.CR)

hauser.CRdiag <- update(hauser.indep, ~ . + Crossings(Father,Son) + Diag(Father,Son))
LRstats(hauser.CRdiag)

vcdExtra documentation built on May 31, 2017, 4:57 a.m.