ade4 (version 1.2-2)

dudi.nsc: Non symmetric correspondence analysis

Description

performs a non symmetric correspondence analysis.

Usage

dudi.nsc(df, scannf = TRUE, nf = 2)

Arguments

df

a data frame containing positive or null values

scannf

a logical value indicating whether the eigenvalues bar plot should be displayed

nf

if scannf FALSE, an integer indicating the number of kept axes

Value

• Returns a list of class nsc and dudi (see dudi) containing also
• N
  sum of the values of the initial table

References

Kroonenberg, P. M., and Lombardo R. (1999) Nonsymmetric correspondence analysis: a tool for analysing contingency tables with a dependence structure. Multivariate Behavioral Research, 34, 367--396.

Examples

data(housetasks)
nsc1 <- dudi.nsc(housetasks, scan = FALSE)
s.label(nsc1$c1, clab = 1.25)
s.arrow(nsc1$li, add.pl = TRUE, clab = 0.75) # see ref p.383