dudi.nsc {ade4}R Documentation

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

Author(s)

Daniel Chessel
Anne B Dufour dufour@biomserv.univ-lyon1.fr

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

Worked out examples


> library(ade4)
> ### Name: dudi.nsc
> ### Title: Non symmetric correspondence analysis
> ### Aliases: dudi.nsc
> ### Keywords: multivariate
> 
> ### ** 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
> 
> 
> 
> 

[Package ade4 Index]