corresp(x, …)# S3 method for matrix
corresp(x, nf = 1, …)
# S3 method for factor
corresp(x, y, …)
# S3 method for data.frame
corresp(x, …)
# S3 method for xtabs
corresp(x, …)
# S3 method for formula
corresp(formula, data, …)
"xtabs" and formulae of the form ~ F1 + F2,
where F1 and F2 are factors.
"correspondence" for which
print, plot and biplot methods are supplied.
The main components are the canonical correlation(s) and the row
and column scores.plot method produces a graphical
representation of the table if nf=1, with the areas of circles
representing the numbers of points. If nf is two or more the
biplot method is called, which plots the second and third columns of
the matrices A = Dr^(-1/2) U L and B = Dc^(-1/2) V L where the
singular value decomposition is U L V. Thus the x-axis is the
canonical correlation times the row and column scores. Although this
is called a biplot, it does not have any useful inner product
relationship between the row and column scores. Think of this as an
equally-scaled plot with two unrelated sets of labels. The origin is
marked on the plot with a cross. (For other versions of this plot see
the book.)svd, princomp.(ct <- corresp(~ Age + Eth, data = quine))
plot(ct)
corresp(caith)
biplot(corresp(caith, nf = 2))
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